Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net (loss) income	$ (870.3)	$ 530.1	$ 617.0
Other comprehensive (loss) income, net of tax:
Pension, SERP and Retiree medical adjustments, net of tax	(61.5)	71.7	(41.0)
Unrealized foreign exchange gain (loss) on intercompany loan, net of effect	1.3	4.3	(3.2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(10.9)	(0.6)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	10.7	0.0
Foreign currency translation adjustments	15.5	20.3	(23.9)
Total other comprehensive (loss) income, net of tax	(44.9)	95.7	(68.1)
Total comprehensive (loss) income	$ (915.2)	$ 625.8	$ 548.9