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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information
Revenue from contract with customer	$ 3,700.4	$ 2,131.2	$ 6,710.5	$ 4,822.0
Income (loss) before income taxes	243.2	42.3	374.6	81.2
U.S.
Segment Reporting Information
Revenue from contract with customer	2,924.9	1,831.1	5,329.3	3,838.7
Income (loss) before income taxes	215.1	74.8	336.6	117.0
U.K.
Segment Reporting Information
Revenue from contract with customer	700.7	263.5	1,250.3	854.2
Income (loss) before income taxes	25.2	(19.7)	33.6	(22.3)
Brazil
Segment Reporting Information
Revenue from contract with customer	74.8	36.6	130.9	129.1
Income (loss) before income taxes	$ 3.0	$ (12.8)	$ 4.3	$ (13.4)

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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