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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (35.3)	$ (67.1)	$ (140.3)	$ (1,746.2)
Postretirement plans (net of $0.0 tax provisions in each period)		172.3		167.9
Foreign currency translation adjustment	(0.8)	2.5	(1.2)	1.8
Other comprehensive (loss) income, net of income taxes	(11.8)	174.8	(34.2)	169.7
Comprehensive (loss) income	(47.1)	107.7	(174.5)	(1,576.5)
Less: Net income (loss) attributable to noncontrolling interests	8.9	0.1	12.6	(5.1)
Comprehensive (loss) income attributable to common stockholders	$ (56.0)	$ 107.6	$ (187.1)	$ (1,571.4)

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