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Reclassifications out of Accumulated Other Comprehensive Income - Reclassifications out of Accumulated Other Comprehensive Income Parenthetical (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cost of Sales [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax   $ 0.0 $ 0.0 $ 8.7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax   (2.4) 2.8 5.3
Selling, General and Administrative Expenses [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax   0.0 0.0 (0.5)
Other Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax   (1.3) 0.0 0.0
Interest Expense [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax   2.0 $ (3.2) $ 0.0
Accounting Standard Update 2018-02 [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 27.7      
Net effect of AAM Pension Payout and the Casting Sale [Member] | Other Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax   $ 7.4