v3.26.1
Corporate Investments and Funds Held for Clients (Tables)
 9 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Debt Securities, Available-for-Sale
Corporate investments and funds held for clients at March 31, 2026 and June 30, 2025 were as follows:
 March 31, 2026
Amortized
Cost		Gross
Unrealized
 Gains		Gross
Unrealized
Losses		 Fair Market Value (A)
Type of issue:   
Money market securities, cash and other cash equivalents$12,597.9 $— $— $12,597.9 
Available-for-sale securities:
Corporate bonds18,465.4 73.7 (330.5)18,208.6 
U.S. Treasury securities10,658.1 53.5 (27.0)10,684.6 
Asset-backed securities2,258.1 17.3 (12.6)2,262.8 
Canadian government obligations and
Canadian government agency obligations		1,891.3 10.3 (24.8)1,876.8 
Canadian provincial bonds1,162.6 11.9 (20.9)1,153.6 
U.S. government agency securities930.3 2.8 (67.3)865.8 
Other securities2,039.2 6.3 (54.1)1,991.4 
Total available-for-sale securities37,405.0 175.8 (537.2)37,043.6 
Total corporate investments and funds held for clients$50,002.9 $175.8 $(537.2)$49,641.5 
(A) Included within available-for-sale securities are funds held for clients with fair values of $37,043.6 million. There are no corporate investments included within available-for-sale securities at March 31, 2026. All available-for-sale securities are included in Level 2 of the fair value hierarchy.
 June 30, 2025
Amortized 
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Market Value (B)
Type of issue:    
Money market securities, cash and other cash equivalents$5,054.6 $— $— $5,054.6 
Available-for-sale securities: 
Corporate bonds17,515.2 108.7 (420.2)17,203.7 
U.S. Treasury securities8,416.8 85.6 (43.7)8,458.7 
Canadian government obligations and
Canadian government agency obligations		1,972.0 16.4 (32.4)1,956.0 
Asset-backed securities1,837.8 22.6 (15.5)1,844.9 
U.S. government agency securities1,328.5 2.3 (80.0)1,250.8 
Canadian provincial bonds1,155.8 13.8 (27.7)1,141.9 
Other securities1,977.3 7.2 (62.8)1,921.7 
Total available-for-sale securities34,203.4 256.6 (682.3)33,777.7 
Total corporate investments and funds held for clients$39,258.0 $256.6 $(682.3)$38,832.3 
(B) Included within available-for-sale securities are corporate investments with fair values of $4,498.8 million and funds held for clients with fair values of $29,278.9 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of March 31, 2026, are as follows: 
March 31, 2026
Securities in Unrealized Loss Position Less Than 12 MonthsSecurities in Unrealized Loss Position Greater Than 12 MonthsTotal
Gross
Unrealized
Losses		Fair Market
Value		Gross
Unrealized
Losses		Fair Market
Value 		Gross
Unrealized
Losses		Fair
Market Value
Corporate bonds$(52.1)$5,174.2 $(278.4)$7,268.0 $(330.5)$12,442.2 
U.S. Treasury securities(17.5)3,162.6 (9.5)758.3 (27.0)3,920.9 
Asset-backed securities(5.1)641.0 (7.5)331.2 (12.6)972.2 
Canadian government obligations and
Canadian government agency obligations		(3.5)625.9 (21.3)487.1 (24.8)1,113.0 
Canadian provincial bonds(1.3)166.1 (19.6)444.0 (20.9)610.1 
U.S. government agency securities(0.7)52.3 (66.6)663.6 (67.3)715.9 
Other securities(12.0)866.6 (42.1)643.6 (54.1)1,510.2 
 $(92.2)$10,688.7 $(445.0)$10,595.8 $(537.2)$21,284.5 

The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2025, are as follows:
June 30, 2025
Securities in Unrealized Loss Position Less Than 12 MonthsSecurities in Unrealized Loss Position Greater Than 12 MonthsTotal
Gross
Unrealized
Losses		Fair Market
Value		Gross
Unrealized
Losses		Fair Market
Value 		Gross
Unrealized
Losses		Fair
Market Value
Corporate bonds$(5.4)$690.4 $(414.8)$10,218.8 $(420.2)$10,909.2 
U.S. Treasury securities(0.8)732.2 (42.9)1,801.7 (43.7)2,533.9 
Canadian government obligations and
Canadian government agency obligations		(1.4)219.2 (31.0)870.2 (32.4)1,089.4 
Asset-backed securities(0.2)101.4 (15.3)481.4 (15.5)582.8 
U.S. government agency securities(0.1)8.0 (79.9)1,093.8 (80.0)1,101.8 
Canadian provincial bonds(0.8)44.3 (26.9)588.8 (27.7)633.1 
Other securities(1.5)168.4 (61.3)1,130.2 (62.8)1,298.6 
 $(10.2)$1,963.9 $(672.1)$16,184.9 $(682.3)$18,148.8 
Schedule of Classification of Corporate Investments on the Consolidated Balance Sheets
Classification of corporate investments on the Consolidated Balance Sheets is as follows:
March 31,June 30,
20262025
Corporate investments:  
Cash and cash equivalents$3,228.4 $3,347.8 
Short-term marketable securities— 4,498.8 
Total corporate investments$3,228.4 $7,846.6 
Schedule of Investment of Funds Held for Clients
Funds held for clients have been invested in the following categories:
March 31,June 30,
20262025
Funds held for clients:  
Restricted cash and cash equivalents held to satisfy client funds obligations$9,369.5 $1,706.8 
Restricted short-term marketable securities held to satisfy client funds obligations6,561.4 3,155.7 
Restricted long-term marketable securities held to satisfy client funds obligations30,482.2 26,123.2 
Total funds held for clients$46,413.1 $30,985.7 
Schedule of Expected Maturities of Available-for-Sale Securities
Expected maturities of available-for-sale securities at March 31, 2026 are as follows:
One year or less$6,561.4 
One year to two years5,225.6 
Two years to three years6,910.7 
Three years to four years5,689.8 
After four years12,656.1 
Total available-for-sale securities$37,043.6