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Components of Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold $ 416.4 $ 502.8
Selling, general and administrative expenses 8.9 14.7
Other operating expense, net 0.3 0.3
Income tax effect (2.8) (2.9)
Net of tax 2.7 34.6
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plan and other postretirement liabilities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold 1.1 0.6
Selling, general and administrative expenses 0.2 (0.4)
Other operating expense, net 0.4 0.4
Income tax effect (0.3) (0.3)
Net of tax 1.4 0.3
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized loss on financial instruments [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of goods sold 0.0 0.0
Income tax effect 0.0 0.0
Net of tax $ (0.0) $ (0.0)