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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, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Defined benefit plans, net of $(18.2) million, $12.7 million and $3.0 million of tax in 2021, 2020 and 2019, respectively $ 69.1 $ (51.1) $ (18.3)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (10.2) (0.2) (4.6)
Changes in cash flow hedges 8.5 (4.4) (14.6)
Other Comprehensive Income (Loss), Net of Tax 67.4 (55.7) (37.5)
Settlement charge 42.3 0.5 9.8
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 (5.6) 2.9 (2.4)
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 14.8 14.2 2.0
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 (19.0) 18.7 (1.3)
Other Income [Member] | Net effect of AAM Pension Payout and the Casting Sale [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
Pension Plan [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Settlement charge 42.3 0.5 10.4
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 (311.0) (259.9) (213.9)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 33.9 (72.0) (61.5) [1]
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax (7.0) 14.2 5.6
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax [2] 53.4 8.2 12.5
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax (11.2) (1.5) (2.6)
Defined benefit plans, net of $(18.2) million, $12.7 million and $3.0 million of tax in 2021, 2020 and 2019, respectively 69.1 (51.1) (46.0)
Accumulated Other Comprehensive Income (Loss), Net of Tax - Ending Balance (241.9) (311.0) (259.9)
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 (101.1) (101.2) (96.6)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax (10.7) 0.1 (4.6)
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 0.5 0.0 0.0
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 (10.2) 0.1 (4.6)
Accumulated Other Comprehensive Income (Loss), Net of Tax - Ending Balance (111.3) (101.1) (101.2)
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 (20.1) (15.7) (1.1)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax 22.2 (41.5) (19.0)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax (4.8) 8.2 6.3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax [3] (9.8) 35.8 (1.7)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax 0.9 (6.9) (0.2)
Changes in cash flow hedges 8.5 (4.4) (14.6)
Accumulated Other Comprehensive Income (Loss), Net of Tax - Ending Balance (11.6) (20.1) (15.7)
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 (432.2) (376.8) (311.6)
Other Comprehensive Income (Loss) Arising During Period, Total, Before Tax 45.4 (113.4) (85.1)
Other Comprehensive Income (Loss), Defined Benefit Plans, before Reclassification Adjustments, Tax (11.8) 22.4 11.9
Other Comprehensive Income (Loss), Reclassification Adjustments, Total, Before Tax 44.1 44.0 10.8
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Defined Benefit Plans, Tax (10.3) (8.4) (2.8)
Other Comprehensive Income (Loss), Net of Tax 67.4 (55.4) (65.2)
Accumulated Other Comprehensive Income (Loss), Net of Tax - Ending Balance $ (364.8) $ (432.2) $ (376.8)
[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] The amount reclassified for 2021 includes a credit to AOCI of $42.3 million related to the effect of the Pension Annuity Purchase, and 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 $(5.6) million in COGS, $14.8 million in interest expense and $(19.0) million in other expense, net for the year ended December 31, 2021, $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 and $(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.