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Reclassifications out of Accumulated Other Comprehensive Income - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Defined benefit plans, net of $12.7 million, $3.0 million and $(9.8) million of tax in 2020, 2019 and 2018, respectively $ (51.1) $ (18.3) $ 38.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (0.2) (4.6) (62.5)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (4.4) (14.6) 5.5
Other Comprehensive Income (Loss), Net of Tax (55.7) (37.5) (18.9)
ASU 2018-02 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
New accounting pronouncement, effect of adoption   27.7  
Cost of Sales [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 2.9 (2.4) 2.8
Interest Expense [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 14.2 2.0 (3.2)
Other Income [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 18.7 (1.3)  
Net effect of AAM Pension Payout and the Casting Sale [Member] | Other Income [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax   7.4  
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Net of Tax - Beginning Balance (259.9) (213.9) (252.0)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (72.0) (61.5) [1] 41.9
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax 14.2 5.6 (8.4)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax [2] 8.2 12.5 6.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax (1.5) (2.6) (1.4)
Defined benefit plans, net of $12.7 million, $3.0 million and $(9.8) million of tax in 2020, 2019 and 2018, respectively (51.1) (46.0) 38.1
Accumulated Other Comprehensive Income (Loss), Net of Tax - Ending Balance (311.0) (259.9) (213.9)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Net of Tax - Beginning Balance (101.2) (96.6) (34.1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax 0.1 (4.6) (62.7)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 0.0 0.0 0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 0.0 0.0 0.2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax 0.0 0.0 0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0.1 (4.6) (62.5)
Accumulated Other Comprehensive Income (Loss), Net of Tax - Ending Balance (101.1) (101.2) (96.6)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Net of Tax - Beginning Balance (15.7) (1.1) (6.6)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax (41.5) (19.0) 5.4
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax 8.2 6.3 (0.2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax [3] 35.8 (1.7) (0.4)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax (6.9) (0.2) 0.7
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (4.4) (14.6) 5.5
Accumulated Other Comprehensive Income (Loss), Net of Tax - Ending Balance (20.1) (15.7) (1.1)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Net of Tax - Beginning Balance (376.8) (311.6) (292.7)
Other Comprehensive Income (Loss) Arising During Period, Total, Before Tax (113.4) (85.1) (15.4)
Other Comprehensive Income (Loss), Defined Benefit Plans, before Reclassification Adjustments, Tax 22.4 11.9 (8.6)
Other Comprehensive Income (Loss), Reclassification Adjustments, Total, Before Tax 44.0 10.8 5.8
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Defined Benefit Plans, Tax (8.4) (2.8) (0.7)
Other Comprehensive Income (Loss), Net of Tax (55.4) (65.2) (18.9)
Accumulated Other Comprehensive Income (Loss), Net of Tax - Ending Balance $ (432.2) $ (376.8) $ (311.6)
[1] ASU 2018-02 became effective on January 1, 2019, and we elected to reclassify the stranded tax effects caused by the 2017 Tax Cuts and Jobs Act, resulting in a decrease in Accumulated other comprehensive income (loss) of $27.7 million at January 1, 2019.
[2] Subsequent to the adoption of ASU 2017-07 effective January 1, 2018, these amounts were reclassified from AOCI to Other, net for the years ended December 31, 2020, 2019 and 2018. The amount reclassified for 2019 includes a credit to AOCI of $7.4 million related to the net effect of the AAM Pension Payout Offer and the Casting Sale. See Note 7 - Employee Benefit Plans and Note 16 - Acquisitions and Dispositions for more detail.
[3] The amounts reclassified from AOCI included $2.9 million in COGS, $14.2 million in interest expense and $18.7 million in other expense, net for the year ended December 31, 2020, $(2.4) million in COGS, $2.0 million in interest expense and $(1.3) million in other expense, net for the year ended December 31, 2019 and $2.8 million in COGS and $(3.2) million in interest expense for the year ended December 31, 2018.