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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net income | $ 366.7 | $ 137.1 | $ 114.5
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax | (58.9) | (63.5) | (50.3)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (9.4) | (27.3) | 7.3
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 7.8 | (6.8) | 1.3
Other Comprehensive Loss, Net of Tax | (60.5) | (97.6) | (41.7)
Comprehensive Income | 306.2 | 39.5 | 72.8
Net loss attributable to the noncontrolling interests | 1.0 | 5.7 | 0.9
Foreign Currency Translation Adjustments Attributable to Noncontrolling Interests | 0.3 | 0.2 | (0.1)
Comprehensive Income Attributable to AAM | $ 306.9 | $ 45.0 | $ 73.8

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