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Segment and Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information
Consolidated revenue	$ 2,040.9	$ 2,057.8	$ 2,329.6
Fixed assets (net)	57.6	67.3
United States
Segment Reporting Information
Consolidated revenue	1,485.2	1,519.3	1,852.6
Fixed assets (net)	48.9	56.3
United Kingdom
Segment Reporting Information
Consolidated revenue	500.5	498.3	434.8
Fixed assets (net)	8.5	10.7
Other
Segment Reporting Information
Consolidated revenue	55.2	40.2	$ 42.2
Fixed assets (net)	$ 0.2	$ 0.3

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