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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, 2021	Mar. 31, 2020
Segment Reporting Information
Revenue from contract with customer	$ 3,010.0	$ 2,690.8
Income (loss) before income taxes	131.4	38.9
U.S.
Segment Reporting Information
Revenue from contract with customer	2,404.3	2,007.6
Income (loss) before income taxes	121.6	42.2
U.K.
Segment Reporting Information
Revenue from contract with customer	549.6	590.7
Income (loss) before income taxes	8.4	(2.7)
Brazil
Segment Reporting Information
Revenue from contract with customer	56.1	92.5
Income (loss) before income taxes	$ 1.4	(0.6)
Severance expense		$ 0.9

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