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SEGMENT INFORMATION - Reportable Segment Revenue, Income (Loss) Before Income Taxes, (Provision) Benefit for Income Taxes and Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information
Total revenues	$ 3,844.4	$ 2,953.9
Income before income taxes	262.3	130.0
U.S.
Segment Reporting Information
Total revenues	3,091.3	2,404.3
Income before income taxes	230.6	121.6
U.K.
Segment Reporting Information
Total revenues	753.0	549.6
Income before income taxes	$ 31.7	$ 8.4

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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