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Reclassifications out of Accumulated Other Comprehensive Income | 12 Months Ended
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Dec. 31, 2020
Reclassifications out of Accumulated Other Comprehensive Income [Abstract] |
Disclosure of Reclassification Amount [Text Block] | 12. RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) (AOCI) during the year ended December 31, 2020, December 31, 2019 and December 31, 2018 are as follows (in millions):
|  | Defined Benefit Plans |  | Foreign Currency Translation Adjustments |  | Unrecognized Loss on Cash Flow Hedges |  | Total
Balance at January 1, 2018 | $ | (252.0) |  |  | $ | (34.1) |  |  | $ | (6.6) |  |  | $ | (292.7) |
Other comprehensive income (loss) before reclassifications | 41.9 |  |  | (62.7) |  |  | 5.4 |  |  | (15.4) |
Income tax effect of other comprehensive income (loss) before reclassifications | (8.4) |  |  | — |  |  | (0.2) |  |  | (8.6) |
Amounts reclassified from accumulated other comprehensive loss into net loss | 6.0 |  | (a) | 0.2 |  |  | (0.4) |  | (b) | 5.8 |
Income taxes reclassified into net loss | (1.4) |  |  | — |  |  | 0.7 |  |  | (0.7) |
Net current period other comprehensive income (loss) | 38.1 |  |  | (62.5) |  |  | 5.5 |  |  | (18.9) |
Balance at December 31, 2018 | $ | (213.9) |  |  | $ | (96.6) |  |  | $ | (1.1) |  |  | $ | (311.6) |
Other comprehensive loss before reclassifications | (61.5) |  | (c) | (4.6) |  |  | (19.0) |  |  | (85.1) |
Income tax effect of other comprehensive loss before reclassifications | 5.6 |  |  | — |  |  | 6.3 |  |  | 11.9 |
Amounts reclassified from accumulated other comprehensive loss into net loss | 12.5 |  | (a) | — |  |  | (1.7) |  | (b) | 10.8 |
Income taxes reclassified into net loss | (2.6) |  |  | — |  |  | (0.2) |  |  | (2.8) |
Net current period other comprehensive loss | (46.0) |  |  | (4.6) |  |  | (14.6) |  |  | (65.2) |
Balance at December 31, 2019 | $ | (259.9) |  |  | $ | (101.2) |  |  | $ | (15.7) |  |  | $ | (376.8) |
Other comprehensive income (loss) before reclassifications | (72.0) |  |  | 0.1 |  |  | (41.5) |  |  | (113.4) |
Income tax effect of other comprehensive income (loss) before reclassifications | 14.2 |  |  | — |  |  | 8.2 |  |  | 22.4 |
Amounts reclassified from accumulated other comprehensive loss into net loss | 8.2 |  | (a) | — |  |  | 35.8 |  | (b) | 44.0 |
Income taxes reclassified into net loss | (1.5) |  |  | — |  |  | (6.9) |  |  | (8.4) |
Net current period other comprehensive income (loss) | (51.1) |  |  | 0.1 |  |  | (4.4) |  |  | (55.4) |
Balance at December 31, 2020 | $ | (311.0) |  |  | $ | (101.1) |  |  | $ | (20.1) |  |  | $ | (432.2) |
(a) | 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.
(b) | 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.
(c) | 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.

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- Definition Reclassifications out of Accumulated Other Comprehensive Income [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for any adjustments made during the period to avoid double counting in comprehensive income items displayed as part of net income that also had been displayed as part of other comprehensive income in that period or earlier periods. These adjustments include reclassifications to net income of items in accumulated comprehensive income, such as deferred gains or losses on qualifying hedges when hedged item reported in net income, holding gains or losses on available-for-sale securities transferred into trading category, unrealized holding gains or losses on debt securities transferred from held-to-maturity category into available-for-sale category and accumulated translation adjustment attributable to foreign subsidiary or investment in foreign entity upon sale or liquidation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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