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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (131.5)	$ 129.9
Postretirement plans and workers’ compensation obligations (net of $0.0 tax provisions in each period)	(2.2)	(2.2)
Foreign currency translation adjustment	(6.8)	0.1
Other comprehensive loss, net of income taxes	(9.0)	(2.1)
Comprehensive (loss) income	(140.5)	127.8
Less: Net (loss) income attributable to noncontrolling interests	(1.8)	5.7
Comprehensive (loss) income attributable to common stockholders	$ (138.7)	$ 122.1

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