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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, 2023	Mar. 31, 2022
Segment Reporting Information
Total revenues	$ 4,130.0	$ 3,844.4
Income before income taxes	206.4	262.3
U.S.
Segment Reporting Information
Total revenues	3,342.4	3,091.3
Income before income taxes	180.7	230.6
U.K.
Segment Reporting Information
Total revenues	787.7	753.0
Income before income taxes	$ 25.7	$ 31.7

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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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