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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Net cash provided by (used in) operating activities $ 647.0 $ 407.6 $ 377.6
Investing activities      
Purchases of property, plant and equipment (477.7) (223.0) (193.5)
Proceeds from sale of property, plant and equipment 2.5 1.7 0.3
Purchase buyouts of leased equipment (13.3) (4.6) 0.0
Proceeds from government grants 0.0 2.8 5.1
Proceeds from sale of business 5.9 0.0 0.0
Final distribution of Reserve Yield Plus Fund 0.0 1.0 0.0
Acquisition of business, net of cash acquired (895.5) (5.6) 0.0
Intercompany activity     0.0
Net cash used in investing activities (1,378.1) (227.7) (188.1)
Financing activities      
Net debt activity 712.7 23.3 (140.2)
Debt issuance costs (91.0) 0.0 0.0
Employee stock option exercises 0.9 0.3 0.8
Purchase of treasury stock (7.0) (5.2) (3.1)
Purchase of noncontrolling interest 0.0 0.0 (1.1)
Intercompany activity 0.0 0.0 0.0
Net cash provided by (used in) financing activities 615.6 18.4 (143.6)
Effect of exchange rate changes on cash 11.1 0.4 (12.6)
Net increase in cash and cash equivalents (104.4) 198.7 33.3
Cash and cash equivalents at beginning of year 481.2 282.5 249.2
Cash and cash equivalents at end of year 376.8 481.2 282.5
Guarantor Subsidiaries [Member]      
Net cash provided by (used in) operating activities 33.1 25.3 68.1
Investing activities      
Purchases of property, plant and equipment (100.4) (18.0) (12.8)
Proceeds from sale of property, plant and equipment 0.3 0.3 0.1
Purchase buyouts of leased equipment 0.0 0.0  
Proceeds from government grants   0.0 0.0
Proceeds from sale of business (1.6)    
Final distribution of Reserve Yield Plus Fund   0.0  
Acquisition of business, net of cash acquired 64.6 (5.6)  
Intercompany activity     (55.0)
Net cash used in investing activities (37.1) (23.3) (67.7)
Financing activities      
Net debt activity (0.7) (0.4) (0.4)
Debt issuance costs 0.0    
Employee stock option exercises 0.0 0.0 0.0
Purchase of treasury stock 0.0 0.0 0.0
Purchase of noncontrolling interest     0.0
Intercompany activity 3.2 0.0 0.0
Net cash provided by (used in) financing activities 2.5 (0.4) (0.4)
Effect of exchange rate changes on cash 0.0 0.0 0.0
Net increase in cash and cash equivalents (1.5) 1.6 0.0
Cash and cash equivalents at beginning of year 1.6 0.0 0.0
Cash and cash equivalents at end of year 0.1 1.6 0.0
Non-Guarantor Subsidiaries [Member]      
Net cash provided by (used in) operating activities 203.5 304.0 145.8
Investing activities      
Purchases of property, plant and equipment (308.2) (168.2) (144.3)
Proceeds from sale of property, plant and equipment 1.9 1.4 0.1
Purchase buyouts of leased equipment 0.0 0.0  
Proceeds from government grants   2.8 5.1
Proceeds from sale of business 0.0    
Final distribution of Reserve Yield Plus Fund   0.0  
Acquisition of business, net of cash acquired (6.6) 0.0  
Intercompany activity     0.0
Net cash used in investing activities (312.9) (164.0) (139.1)
Financing activities      
Net debt activity (12.2) 24.4 3.0
Debt issuance costs 0.0    
Employee stock option exercises 0.0 0.0 0.0
Purchase of treasury stock 0.0 0.0 0.0
Purchase of noncontrolling interest     (1.1)
Intercompany activity 0.0 0.0 55.0
Net cash provided by (used in) financing activities (12.2) 24.4 56.9
Effect of exchange rate changes on cash 11.1 0.4 (12.6)
Net increase in cash and cash equivalents (110.5) 164.8 51.0
Cash and cash equivalents at beginning of year 395.3 230.5 179.5
Cash and cash equivalents at end of year 284.8 395.3 230.5
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
Purchase buyouts of leased equipment 0.0 0.0  
Proceeds from government grants   0.0 0.0
Proceeds from sale of business 0.0    
Final distribution of Reserve Yield Plus Fund   0.0  
Acquisition of business, net of cash acquired 0.0 0.0  
Intercompany activity     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    
Employee stock option exercises 0.0 0.0 0.0
Purchase of treasury stock (7.0) (5.2) (3.1)
Purchase of noncontrolling interest     0.0
Intercompany activity 7.0 5.2 3.1
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 410.4 78.3 163.7
Investing activities      
Purchases of property, plant and equipment (69.1) (36.8) (36.4)
Proceeds from sale of property, plant and equipment 0.3 0.0 0.1
Purchase buyouts of leased equipment (13.3) (4.6)  
Proceeds from government grants   0.0 0.0
Proceeds from sale of business 7.5    
Final distribution of Reserve Yield Plus Fund   1.0  
Acquisition of business, net of cash acquired (953.5) 0.0  
Intercompany activity     0.0
Net cash used in investing activities (1,028.1) (40.4) (36.3)
Financing activities      
Net debt activity 725.6 (0.7) (142.8)
Debt issuance costs (91.0)    
Employee stock option exercises 0.9 0.3 0.8
Purchase of treasury stock 0.0 0.0 0.0
Purchase of noncontrolling interest     0.0
Intercompany activity (10.2) (5.2) (3.1)
Net cash provided by (used in) financing activities 625.3 (5.6) (145.1)
Effect of exchange rate changes on cash 0.0 0.0 0.0
Net increase in cash and cash equivalents 7.6 32.3 (17.7)
Cash and cash equivalents at beginning of year 84.3 52.0 69.7
Cash and cash equivalents at end of year 91.9 84.3 52.0
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
Purchase buyouts of leased equipment 0.0 0.0  
Proceeds from government grants   0.0 0.0
Proceeds from sale of business 0.0    
Final distribution of Reserve Yield Plus Fund   0.0  
Acquisition of business, net of cash acquired 0.0 0.0  
Intercompany activity     55.0
Net cash used in investing activities 0.0 0.0 55.0
Financing activities      
Net debt activity 0.0 0.0 0.0
Debt issuance costs 0.0    
Employee stock option exercises 0.0 0.0 0.0
Purchase of treasury stock 0.0 0.0 0.0
Purchase of noncontrolling interest     0.0
Intercompany activity 0.0 0.0 (55.0)
Net cash provided by (used in) financing activities 0.0 0.0 (55.0)
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