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Supplemental Guarantor Condensed Consolidating Financial Statements Supplemental Guarantor Condensed Consolidating Statements of Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Net sales |  |
External | $ 1,049.9 | $ 969.2
Intercompany | 0.0 | 0.0
Total net sales | 1,049.9 | 969.2
Cost of goods sold | 839.2 | 795.2
Gross profit | 210.7 | 174.0
Selling, general and administrative expenses | 82.8 | 75.6
Restructuring and acquisition-related costs | 16.0 | 0.0
Operating income (loss) | 111.9 | 98.4
Non-operating income (expense), net | (26.0) | (22.0)
Income (loss) before income taxes | 85.9 | 76.4
Income tax expense (benefit) | 7.5 | 15.3
Earnings (loss) from equity in subsidiaries | 0.0 | 0.0
Net income (loss) before royalties | 78.4 | 61.1
Royalties | 0.0 | 0.0
Net income after royalties | 78.4 | 61.1
Other comprehensive income, net of tax | 27.1 | 22.6
Comprehensive income | 105.5 | 83.7
Holdings [Member] |  |
Net sales |  |
External | 0.0 | 0.0
Intercompany | 0.0 | 0.0
Total net sales | 0.0 | 0.0
Cost of goods sold | 0.0 | 0.0
Gross profit | 0.0 | 0.0
Selling, general and administrative expenses | 0.0 | 0.0
Restructuring and acquisition-related costs | 0.0 |
Operating income (loss) | 0.0 | 0.0
Non-operating income (expense), net | 0.0 | 0.0
Income (loss) before income taxes | 0.0 | 0.0
Income tax expense (benefit) | 0.0 | 0.0
Earnings (loss) from equity in subsidiaries | 78.4 | 61.1
Net income (loss) before royalties | 78.4 | 61.1
Royalties | 0.0 | 0.0
Net income after royalties | 78.4 | 61.1
Other comprehensive income, net of tax | 27.1 | 22.6
Comprehensive income | 105.5 | 83.7
AAM Inc. [Member] |  |
Net sales |  |
External | 296.6 | 283.2
Intercompany | 0.3 | 1.6
Total net sales | 296.9 | 284.8
Cost of goods sold | 277.2 | 276.3
Gross profit | 19.7 | 8.5
Selling, general and administrative expenses | 73.8 | 67.5
Restructuring and acquisition-related costs | 15.3 |
Operating income (loss) | (69.4) | (59.0)
Non-operating income (expense), net | (26.2) | (24.3)
Income (loss) before income taxes | (95.6) | (83.3)
Income tax expense (benefit) | (2.8) | 7.8
Earnings (loss) from equity in subsidiaries | 91.6 | 92.9
Net income (loss) before royalties | (1.2) | 1.8
Royalties | 79.6 | 59.3
Net income after royalties | 78.4 | 61.1
Other comprehensive income, net of tax | 27.1 | 22.6
Comprehensive income | 105.5 | 83.7
Guarantor Subsidiaries [Member] |  |
Net sales |  |
External | 50.1 | 54.8
Intercompany | 66.7 | 59.7
Total net sales | 116.8 | 114.5
Cost of goods sold | 94.9 | 92.5
Gross profit | 21.9 | 22.0
Selling, general and administrative expenses | 0.0 | 0.0
Restructuring and acquisition-related costs | 0.0 |
Operating income (loss) | 21.9 | 22.0
Non-operating income (expense), net | 2.4 | 3.0
Income (loss) before income taxes | 24.3 | 25.0
Income tax expense (benefit) | 0.1 | 0.1
Earnings (loss) from equity in subsidiaries | (0.6) | (9.6)
Net income (loss) before royalties | 23.6 | 15.3
Royalties | 0.0 | 0.0
Net income after royalties | 23.6 | 15.3
Other comprehensive income, net of tax | 10.5 | 15.7
Comprehensive income | 34.1 | 31.0
Non-Guarantor Subsidiaries [Member] |  |
Net sales |  |
External | 703.2 | 631.2
Intercompany | 4.9 | 3.7
Total net sales | 708.1 | 634.9
Cost of goods sold | 539.0 | 491.4
Gross profit | 169.1 | 143.5
Selling, general and administrative expenses | 9.0 | 8.1
Restructuring and acquisition-related costs | 0.7 |
Operating income (loss) | 159.4 | 135.4
Non-operating income (expense), net | (2.2) | (0.7)
Income (loss) before income taxes | 157.2 | 134.7
Income tax expense (benefit) | 10.2 | 7.4
Earnings (loss) from equity in subsidiaries | 0.0 | 0.0
Net income (loss) before royalties | 147.0 | 127.3
Royalties | (79.6) | (59.3)
Net income after royalties | 67.4 | 68.0
Other comprehensive income, net of tax | 26.4 | 19.8
Comprehensive income | 93.8 | 87.8
Consolidation, Eliminations [Member] |  |
Net sales |  |
External | 0.0 | 0.0
Intercompany | (71.9) | (65.0)
Total net sales | (71.9) | (65.0)
Cost of goods sold | (71.9) | (65.0)
Gross profit | 0.0 | 0.0
Selling, general and administrative expenses | 0.0 | 0.0
Restructuring and acquisition-related costs | 0.0 |
Operating income (loss) | 0.0 | 0.0
Non-operating income (expense), net | 0.0 | 0.0
Income (loss) before income taxes | 0.0 | 0.0
Income tax expense (benefit) | 0.0 | 0.0
Earnings (loss) from equity in subsidiaries | (169.4) | (144.4)
Net income (loss) before royalties | (169.4) | (144.4)
Royalties | 0.0 | 0.0
Net income after royalties | (169.4) | (144.4)
Other comprehensive income, net of tax | (64.0) | (58.1)
Comprehensive income | $ (233.4) | $ (202.5)

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