Segment and Geographical Area Information (External Revenue and Long-Lived Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	$ 644.8	$ 581.9
Long-lived assets	234.8		$ 231.9
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	462.0	424.5
Long-lived assets	177.8		178.6
Total International
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	182.8	157.4
Long-lived assets	57.0		53.3
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	49.2	43.7
Long-lived assets	4.7		4.9
Continental Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	57.0	50.6
Long-lived assets	5.8		6.3
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	18.1	15.1
Long-lived assets	1.0		1.1
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	42.7	33.1
Long-lived assets	17.6		17.9
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	11.8	11.9
Long-lived assets	27.7		22.8
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	4.0	$ 3.0
Long-lived assets	$ 0.2		$ 0.3