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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information
Total revenues	$ 4,696.4	$ 4,558.5	$ 9,166.9	$ 8,688.5
Income before income taxes	183.0	227.9	376.3	434.3
U.S.
Segment Reporting Information
Total revenues	3,921.2	3,799.6	7,566.9	7,142.0
Income before income taxes	173.3	207.8	353.3	388.5
U.K.
Segment Reporting Information
Total revenues	775.2	758.9	1,600.0	1,546.5
Income before income taxes	$ 9.7	$ 20.1	$ 23.0	$ 45.8

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