Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Interest expense	$ 22.7	$ 30.8	$ 45.8	$ 57.9
Benefit for income taxes	(12.5)	(78.4)	(23.1)	(11.5)
Net income (loss) attributable to parent	$ 233.9	$ (177.6)	143.5	(214.4)
Reclassification out of Accumulated Other Comprehensive (Loss) Income
Income Statement [Abstract]
Net income (loss) attributable to parent			1.9	11.0
Unrecognized Gains (Losses) on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive (Loss) Income
Income Statement [Abstract]
Interest expense			0.0	13.2
Benefit for income taxes			0.0	(3.3)
Net income (loss) attributable to parent			0.0	9.9
Pension and Other Postretirement Benefit Plans | Reclassification out of Accumulated Other Comprehensive (Loss) Income
Income Statement [Abstract]
Cost of sales and Selling and administrative expenses			2.6	1.5
Benefit for income taxes			(0.7)	(0.4)
Net income (loss) attributable to parent			$ 1.9	$ 1.1