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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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information
Total revenues	$ 4,558.5	$ 4,145.4	$ 8,688.5	$ 7,989.7
Income before income taxes	227.9	260.1	434.3	522.4
U.S.
Segment Reporting Information
Total revenues	3,799.6	3,437.2	7,142.0	6,528.5
Income before income taxes	207.8	241.7	388.5	472.3
U.K.
Segment Reporting Information
Total revenues	758.9	708.2	1,546.5	1,461.2
Income before income taxes	$ 20.1	$ 18.4	$ 45.8	$ 50.1

X

- Definition

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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