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Supplemental Guarantor Condensed Consolidating Financial Statements Condensed Consolidating Statements of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Ownership in Subsidiary, Percentage | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
External |  |  |  |  |  |  |  |  | $ 3,903.1 | $ 3,696.0 | $ 3,207.3
Intercompany |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total net sales | $ 958.4 | $ 971.6 | $ 1,004.0 | $ 969.1 | $ 939.5 | $ 950.8 | $ 946.9 | $ 858.8 | 3,903.1 | 3,696.0 | 3,207.3
Cost of goods sold |  |  |  |  |  |  |  |  | 3,267.7 | 3,173.2 | 2,728.6
Gross Profit | $ 159.8 | $ 158.3 | $ 164.5 | $ 152.8 | $ 111.2 | $ 140.7 | $ 149.0 | $ 121.9 | 635.4 | 522.8 | 478.7
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 277.3 | 255.2 | 238.4
Operating income (loss) |  |  |  |  |  |  |  |  | 358.1 | 267.6 | 240.3
Non-operating income (expense), net |  |  |  |  |  |  |  |  | (85.4) | (90.9) | (154.0)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 272.7 | 176.7 | 86.3
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 37.1 | 33.7 | (8.2)
Earnings (loss) from equity in subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) before royalties |  |  |  |  |  |  |  |  | 235.6 | 143.0 | 94.5
Royalties |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income after royalties |  |  |  |  |  |  |  |  | 235.6 | 143.0 | 94.5
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (59.6) | (80.7) | 48.4
Comprehensive income |  |  |  |  |  |  |  |  | 176.0 | 62.3 | 142.9
Holdings [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
External |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Intercompany |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total net sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of goods sold |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gross Profit |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Non-operating income (expense), net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Earnings (loss) from equity in subsidiaries |  |  |  |  |  |  |  |  | 235.6 | 143.0 | 94.5
Net income (loss) before royalties |  |  |  |  |  |  |  |  | 235.6 | 143.0 | 94.5
Royalties |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income after royalties |  |  |  |  |  |  |  |  | 235.6 | 143.0 | 94.5
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (59.6) | (80.7) | 48.4
Comprehensive income |  |  |  |  |  |  |  |  | 176.0 | 62.3 | 142.9
AAM Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
External |  |  |  |  |  |  |  |  | 1,149.0 | 1,099.5 | 773.6
Intercompany |  |  |  |  |  |  |  |  | 9.4 | 13.1 | 15.3
Total net sales |  |  |  |  |  |  |  |  | 1,158.4 | 1,112.6 | 788.9
Cost of goods sold |  |  |  |  |  |  |  |  | 1,114.5 | 1,112.4 | 769.4
Gross Profit |  |  |  |  |  |  |  |  | 43.9 | 0.2 | 19.5
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 210.6 | 194.0 | 182.4
Operating income (loss) |  |  |  |  |  |  |  |  | (166.7) | (193.8) | (162.9)
Non-operating income (expense), net |  |  |  |  |  |  |  |  | (99.3) | (103.0) | (155.1)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (266.0) | (296.8) | (318.0)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 21.6 | (11.8) | (24.9)
Earnings (loss) from equity in subsidiaries |  |  |  |  |  |  |  |  | 262.3 | 204.0 | 167.0
Net income (loss) before royalties |  |  |  |  |  |  |  |  | (25.3) | (81.0) | (126.1)
Royalties |  |  |  |  |  |  |  |  | 260.9 | 224.0 | 220.6
Net income after royalties |  |  |  |  |  |  |  |  | 235.6 | 143.0 | 94.5
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (59.6) | (80.7) | 48.4
Comprehensive income |  |  |  |  |  |  |  |  | 176.0 | 62.3 | 142.9
Guarantor Subsidiaries of Certain Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
External |  |  |  |  |  |  |  |  | 210.3 | 225.1 | 226.0
Intercompany |  |  |  |  |  |  |  |  | 258.3 | 246.9 | 226.1
Total net sales |  |  |  |  |  |  |  |  | 468.6 | 472.0 | 452.1
Cost of goods sold |  |  |  |  |  |  |  |  | 385.2 | 396.1 | 389.0
Gross Profit |  |  |  |  |  |  |  |  | 83.4 | 75.9 | 63.1
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.1 | 0.2 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 83.3 | 75.7 | 63.0
Non-operating income (expense), net |  |  |  |  |  |  |  |  | 10.1 | 9.0 | 10.7
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 93.4 | 84.7 | 73.7
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 5.5 | 0.9 | 0.9
Earnings (loss) from equity in subsidiaries |  |  |  |  |  |  |  |  | (20.8) | (23.3) | (21.7)
Net income (loss) before royalties |  |  |  |  |  |  |  |  | 67.1 | 60.5 | 51.1
Royalties |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income after royalties |  |  |  |  |  |  |  |  | 67.1 | 60.5 | 51.1
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (63.6) | (23.5) | (7.2)
Comprehensive income |  |  |  |  |  |  |  |  | 3.5 | 37.0 | 43.9
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
External |  |  |  |  |  |  |  |  | 2,543.8 | 2,371.4 | 2,207.7
Intercompany |  |  |  |  |  |  |  |  | 19.0 | 21.6 | 14.0
Total net sales |  |  |  |  |  |  |  |  | 2,562.8 | 2,393.0 | 2,221.7
Cost of goods sold |  |  |  |  |  |  |  |  | 2,054.7 | 1,946.3 | 1,825.6
Gross Profit |  |  |  |  |  |  |  |  | 508.1 | 446.7 | 396.1
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 66.6 | 61.0 | 55.9
Operating income (loss) |  |  |  |  |  |  |  |  | 441.5 | 385.7 | 340.2
Non-operating income (expense), net |  |  |  |  |  |  |  |  | 3.8 | 3.1 | (9.6)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 445.3 | 388.8 | 330.6
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 10.0 | 44.6 | 15.8
Earnings (loss) from equity in subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) before royalties |  |  |  |  |  |  |  |  | 435.3 | 344.2 | 314.8
Royalties |  |  |  |  |  |  |  |  | (260.9) | (224.0) | (220.6)
Net income after royalties |  |  |  |  |  |  |  |  | 174.4 | 120.2 | 94.2
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (68.4) | (34.8) | (10.8)
Comprehensive income |  |  |  |  |  |  |  |  | 106.0 | 85.4 | 83.4
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
External |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Intercompany |  |  |  |  |  |  |  |  | (286.7) | (281.6) | (255.4)
Total net sales |  |  |  |  |  |  |  |  | (286.7) | (281.6) | (255.4)
Cost of goods sold |  |  |  |  |  |  |  |  | (286.7) | (281.6) | (255.4)
Gross Profit |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Non-operating income (expense), net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Earnings (loss) from equity in subsidiaries |  |  |  |  |  |  |  |  | (477.1) | (323.7) | (239.8)
Net income (loss) before royalties |  |  |  |  |  |  |  |  | (477.1) | (323.7) | (239.8)
Royalties |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income after royalties |  |  |  |  |  |  |  |  | (477.1) | (323.7) | (239.8)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 191.6 | 139.0 | (30.4)
Comprehensive income |  |  |  |  |  |  |  |  | $ (285.5) | $ (184.7) | $ (270.2)

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