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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (79.7)	$ (131.5)
Postretirement plans (net of $0.0 tax provisions in each period)	(11.0)	(2.2)
Foreign currency translation adjustment	(0.2)	(6.8)
Other comprehensive loss, net of income taxes	(11.2)	(9.0)
Comprehensive loss	(90.9)	(140.5)
Less: Net income (loss) attributable to noncontrolling interests	0.4	(1.8)
Comprehensive loss attributable to common stockholders	$ (91.3)	$ (138.7)

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