Segment and Geographical Area Information (External Revenue and Long-Lived Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	$ 581.9	$ 542.8
Long-lived assets	221.6		$ 218.9
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	424.5	390.9
Long-lived assets	187.2		189.5
Total International
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	157.4	151.9
Long-lived assets	34.4		29.4
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	43.7	38.9
Long-lived assets	5.7		6.1
Continental Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	50.6	49.7
Long-lived assets	5.7		5.3
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	15.1	15.0
Long-lived assets	1.5		1.6
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	33.1	32.6
Long-lived assets	12.2		6.6
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	11.9	12.7
Long-lived assets	9.0		9.6
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
External revenue	3.0	$ 3.0
Long-lived assets	$ 0.3		$ 0.2