v3.26.1
Investments (Tables)
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Values of Investment in Fixed Maturities
The following tables present cost or amortized cost and fair values of investment in fixed maturities as of March 31, 2026 and December 31, 2025 ($ in millions):
Cost or Amortized CostGross
Unrealized		Fair
Value
GainsLosses
March 31, 2026
Corporate debt securities$491.8 $0.4 $(1.3)$490.9 
U.S. Government obligations163.7 0.1 (0.7)163.1 
Asset-backed securities50.7 0.1 (0.1)50.7 
Non-U.S. government obligations
27.2 — (0.1)27.1 
Total$733.4 $0.6 $(2.2)$731.8 
December 31, 2025
Corporate debt securities$499.2 $2.0 $— $501.2 
U.S. Government obligations139.5 0.6 — 140.1 
Asset-backed securities45.3 0.2 — 45.5 
Non-U.S. government obligations
22.0 — — 22.0 
Total$706.0 $2.8 $— $708.8 
Schedule of Contractual Maturities of Bonds
The following table presents the cost or amortized cost and estimated fair value of investments in fixed maturities as of March 31, 2026 by contractual maturity ($ in millions). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
March 31, 2026
Cost or
Amortized
Cost		Fair Value
Due in one year or less$183.7 $184.0 
Due after one year through five years544.3 542.4 
Due after five years through ten years5.4 5.4 
Due after ten years— — 
Total$733.4 $731.8 
Schedule of Net Investment Income
Details of the Company's net investment income is as follows ($ in millions):
Three Months Ended
March 31,
20262025
Interest on cash and cash equivalents$2.1 $2.2 
Fixed maturities7.7 7.1 
Short-term investments0.1 0.3 
Total9.9 9.6 
Investment expense
0.1 0.1 
Net investment income$9.8 $9.5 
Schedule of Aging of Gross Unrealized losses
The following table presents the gross unrealized losses and related fair values for the Company’s investment in fixed maturities, grouped by duration of time in a continuous unrealized loss position as of March 31, 2026 and December 31, 2025 ($ in millions):
Less than 12 Months12 Months or MoreTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
March 31, 2026
Corporate debt securities$274.2 $(1.3)$4.9 $— $279.1 $(1.3)
U.S. Government obligations131.7 (0.7)— — 131.7 (0.7)
Asset-backed securities19.4 (0.1)— — 19.4 (0.1)
Non-U.S. government obligations
22.2 (0.1)— — 22.2 (0.1)
Total$447.5 $(2.2)$4.9 $— $452.4 $(2.2)
Less than 12 Months12 Months or MoreTotal
Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
December 31, 2025
Corporate debt securities$45.9 $— $4.9 $— $50.8 $— 
U.S. Government obligations0.4 — — — 0.4 — 
Asset-backed securities— — — — — — 
Non-U.S. government obligations
7.2 — — — 7.2 — 
Total$53.5 $— $4.9 $— $58.4 $—