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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information
Revenue from contract with customer	$ 3,509.2	$ 3,039.6	$ 10,219.7	$ 7,861.7
Income (loss) before income taxes	225.0	161.0	599.6	242.2
U.S.
Segment Reporting Information
Revenue from contract with customer	2,662.4	2,244.6	7,991.6	6,083.3
Income (loss) before income taxes	195.5	132.9	532.1	249.8
U.K.
Segment Reporting Information
Revenue from contract with customer	750.4	740.8	2,000.7	1,595.0
Income (loss) before income taxes	28.7	27.1	62.3	4.7
Brazil
Segment Reporting Information
Revenue from contract with customer	96.4	54.3	227.3	183.4
Income (loss) before income taxes	$ 0.9	$ 1.0	$ 5.2	$ (12.4)

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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