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Supplemental Guarantor Condensed Consolidating Financial Statements Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net cash provided by (used in) operating activities | $ 377.6 | $ 318.4 | $ 223.0
Investing activities |  |  |
Purchases of property, plant and equipment | (193.5) | (206.5) | (251.9)
Proceeds from sale of property, plant and equipment | 0.3 | 9.1 | 9.1
Proceeds from government grants | 5.1 | 2.1 | 0.0
Intercompany activity | 0.0 | 0.0 | 0.0
Proceeds from sale-leaseback of equipment | 0.0 | 0.0 | 24.1
Net cash used in investing activities | (188.1) | (195.3) | (218.7)
Financing activities |  |  |
Net debt activity | (140.2) | (22.0) | 104.8
Debt issuance costs | 0.0 | (0.3) | (16.7)
Employee stock option exercises, including tax benefit | 0.8 | 1.2 | 1.1
Purchase of treasury stock | (3.1) | (0.3) | (0.4)
Payments to Noncontrolling Interests | 1.1 | 0.0 | 0.0
Intercompany Activity - Financing | 0.0 | 0.0 | 0.0
Net cash provided by (used in) financing activities | (143.6) | (21.4) | 88.8
Effect of exchange rate changes on cash | (12.6) | (6.5) | (1.5)
Net increase in cash and cash equivalents | 33.3 | 95.2 | 91.6
Cash and cash equivalents at beginning of year | 249.2 | 154.0 | 62.4
Cash and cash equivalents at end of year | 282.5 | 249.2 | 154.0
Holdings [Member] |  |  |
Net cash provided by (used in) operating activities | 0.0 | 0.0 | 0.0
Investing activities |  |  |
Purchases of property, plant and equipment | 0.0 | 0.0 | 0.0
Proceeds from sale of property, plant and equipment | 0.0 | 0.0 | 0.0
Proceeds from government grants | 0.0 | 0.0 |
Intercompany activity | 0.0 | 0.0 | 0.0
Proceeds from sale-leaseback of equipment |  |  | 0.0
Net cash used in investing activities | 0.0 | 0.0 | 0.0
Financing activities |  |  |
Net debt activity | 0.0 | 0.0 | 0.0
Debt issuance costs |  | 0.0 | 0.0
Employee stock option exercises, including tax benefit | 0.0 | 0.0 | 0.0
Purchase of treasury stock | (3.1) | (0.3) | (0.4)
Payments to Noncontrolling Interests | 0.0 |  |
Intercompany Activity - Financing | 3.1 | 0.3 | 0.4
Net cash provided by (used in) financing activities | 0.0 | 0.0 | 0.0
Effect of exchange rate changes on cash | 0.0 | 0.0 | 0.0
Net increase in cash and cash equivalents | 0.0 | 0.0 | 0.0
Cash and cash equivalents at beginning of year | 0.0 | 0.0 | 0.0
Cash and cash equivalents at end of year | 0.0 | 0.0 | 0.0
AAM Inc. [Member] |  |  |
Net cash provided by (used in) operating activities | 163.7 | 83.4 | (35.9)
Investing activities |  |  |
Purchases of property, plant and equipment | (36.4) | (51.3) | (61.2)
Proceeds from sale of property, plant and equipment | 0.1 | 7.9 | 5.1
Proceeds from government grants | 0.0 | 0.0 |
Intercompany activity | 0.0 | 0.0 | 0.0
Proceeds from sale-leaseback of equipment |  |  | 24.1
Net cash used in investing activities | (36.3) | (43.4) | (32.0)
Financing activities |  |  |
Net debt activity | (142.8) | (7.8) | 110.1
Debt issuance costs |  | (0.3) | (16.6)
Employee stock option exercises, including tax benefit | 0.8 | 1.2 | 1.1
Purchase of treasury stock | 0.0 | 0.0 | 0.0
Payments to Noncontrolling Interests | 0.0 |  |
Intercompany Activity - Financing | (3.1) | (0.3) | (0.4)
Net cash provided by (used in) financing activities | (145.1) | (7.2) | 94.2
Effect of exchange rate changes on cash | 0.0 | 0.0 | 0.0
Net increase in cash and cash equivalents | (17.7) | 32.8 | 26.3
Cash and cash equivalents at beginning of year | 69.7 | 36.9 | 10.6
Cash and cash equivalents at end of year | 52.0 | 69.7 | 36.9
Guarantor Subsidiaries of Certain Notes [Member] |  |  |
Net cash provided by (used in) operating activities | 68.1 | 41.9 | 64.9
Investing activities |  |  |
Purchases of property, plant and equipment | (12.8) | (18.6) | (12.5)
Proceeds from sale of property, plant and equipment | 0.1 | 0.4 | 0.5
Proceeds from government grants | 0.0 | 0.0 |
Intercompany activity | 55.0 | 23.3 | 52.6
Proceeds from sale-leaseback of equipment |  |  | 0.0
Net cash used in investing activities | (67.7) | (41.5) | (64.6)
Financing activities |  |  |
Net debt activity | (0.4) | (0.4) | (0.3)
Debt issuance costs |  | 0.0 | 0.0
Employee stock option exercises, including tax benefit | 0.0 | 0.0 | 0.0
Purchase of treasury stock | 0.0 | 0.0 | 0.0
Payments to Noncontrolling Interests | 0.0 |  |
Intercompany Activity - Financing | 0.0 | 0.0 | 0.0
Net cash provided by (used in) financing activities | (0.4) | (0.4) | (0.3)
Effect of exchange rate changes on cash | 0.0 | 0.0 | 0.0
Net increase in cash and cash equivalents | 0.0 | 0.0 | 0.0
Cash and cash equivalents at beginning of year | 0.0 | 0.0 | 0.0
Cash and cash equivalents at end of year | 0.0 | 0.0 | 0.0
Non-Guarantor Subsidiaries [Member] |  |  |
Net cash provided by (used in) operating activities | 145.8 | 193.1 | 194.0
Investing activities |  |  |
Purchases of property, plant and equipment | (144.3) | (136.6) | (178.2)
Proceeds from sale of property, plant and equipment | 0.1 | 0.8 | 3.5
Proceeds from government grants | 5.1 | 2.1 |
Intercompany activity | 0.0 | 0.0 | 0.0
Proceeds from sale-leaseback of equipment |  |  | 0.0
Net cash used in investing activities | (139.1) | (133.7) | (174.7)
Financing activities |  |  |
Net debt activity | 3.0 | (13.8) | (5.0)
Debt issuance costs |  | 0.0 | (0.1)
Employee stock option exercises, including tax benefit | 0.0 | 0.0 | 0.0
Purchase of treasury stock | 0.0 | 0.0 | 0.0
Payments to Noncontrolling Interests | 1.1 |  |
Intercompany Activity - Financing | 55.0 | 23.3 | 52.6
Net cash provided by (used in) financing activities | 56.9 | 9.5 | 47.5
Effect of exchange rate changes on cash | (12.6) | (6.5) | (1.5)
Net increase in cash and cash equivalents | 51.0 | 62.4 | 65.3
Cash and cash equivalents at beginning of year | 179.5 | 117.1 | 51.8
Cash and cash equivalents at end of year | 230.5 | 179.5 | 117.1
Consolidation, Eliminations [Member] |  |  |
Net cash provided by (used in) operating activities | 0.0 | 0.0 | 0.0
Investing activities |  |  |
Purchases of property, plant and equipment | 0.0 | 0.0 | 0.0
Proceeds from sale of property, plant and equipment | 0.0 | 0.0 | 0.0
Proceeds from government grants | 0.0 | 0.0 |
Intercompany activity | (55.0) | (23.3) | (52.6)
Proceeds from sale-leaseback of equipment |  |  | 0.0
Net cash used in investing activities | 55.0 | 23.3 | 52.6
Financing activities |  |  |
Net debt activity | 0.0 | 0.0 | 0.0
Debt issuance costs |  | 0.0 | 0.0
Employee stock option exercises, including tax benefit | 0.0 | 0.0 | 0.0
Purchase of treasury stock | 0.0 | 0.0 | 0.0
Payments to Noncontrolling Interests | 0.0 |  |
Intercompany Activity - Financing | (55.0) | (23.3) | (52.6)
Net cash provided by (used in) financing activities | (55.0) | (23.3) | (52.6)
Effect of exchange rate changes on cash | 0.0 | 0.0 | 0.0
Net increase in cash and cash equivalents | 0.0 | 0.0 | 0.0
Cash and cash equivalents at beginning of year | 0.0 | 0.0 | 0.0
Cash and cash equivalents at end of year | $ 0.0 | $ 0.0 | $ 0.0

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