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INTERIM FINANCIAL INFORMATION - Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Business And Organization
Selling, general and administrative expenses	$ 385.1	$ 305.8		$ 1,080.3	$ 870.9
Additional paid-in capital	320.2			320.2		$ 308.3
Net income (loss)	$ 172.1	$ 126.4		$ 465.0	$ 186.4
Decrease to diluted earnings per common share (in dollars per share)	$ (9.33)	$ (6.83)		$ (25.21)	$ (10.08)
Restatement Adjustment
Business And Organization
Selling, general and administrative expenses			$ 10.6
Additional paid-in capital			10.6
Net income (loss)			$ (9.7)
Decrease to diluted earnings per common share (in dollars per share)			$ 0.53

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