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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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information
Total revenues	$ 5,221.4	$ 4,705.1	$ 14,388.3	$ 13,393.7
Income before income taxes	159.6	220.5	535.8	654.8
U.S.
Segment Reporting Information
Total revenues	3,971.1	3,899.7	11,538.0	11,041.7
Income before income taxes	151.7	203.1	504.9	591.6
U.K.
Segment Reporting Information
Total revenues	1,250.3	805.5	2,850.2	2,352.0
Income before income taxes	$ 7.9	$ 17.4	$ 30.9	$ 63.2

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