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Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Consolidated revenue	$ 2,057.8	$ 2,329.6	$ 2,412.4
Fixed assets (net)	67.3	68.5
United States
Segment Reporting Information
Consolidated revenue	1,519.3	1,852.6	1,838.7
Fixed assets (net)	56.3	57.5
United Kingdom
Segment Reporting Information
Consolidated revenue	498.3	434.8	528.6
Fixed assets (net)	10.7	10.6
Other
Segment Reporting Information
Consolidated revenue	40.2	42.2	$ 45.1
Fixed assets (net)	$ 0.3	$ 0.4

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