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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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