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Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information
Consolidated revenue	$ 2,027.5	$ 2,239.6	$ 2,378.4
Fixed assets (net)	79.6	92.3
United States
Segment Reporting Information
Consolidated revenue	1,524.0	1,642.2	1,611.7
Fixed assets (net)	64.2	75.6
United Kingdom
Segment Reporting Information
Consolidated revenue	462.3	515.2	628.8
Fixed assets (net)	14.6	15.8
Other
Segment Reporting Information
Consolidated revenue	41.2	82.2	$ 137.9
Fixed assets (net)	$ 0.8	$ 0.9

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