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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (1,873.8)	$ (185.1)	$ 663.8
Postretirement plans and workers’ compensation obligations (net of respective net tax provision of $0.0, $0.0 and $7.1)	168.1	(8.7)	44.6
Foreign currency translation adjustment	6.1	0.2	(5.9)
Other comprehensive income (loss), net of income taxes	174.2	(8.5)	38.7
Comprehensive (loss) income	(1,699.6)	(193.6)	702.5
Less: Series A Convertible Preferred Stock dividends	0.0	0.0	102.5
Less: Net (loss) income attributable to noncontrolling interests	(3.5)	26.2	16.9
Comprehensive (loss) income attributable to common stockholders	$ (1,696.1)	$ (219.8)	$ 583.1

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