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Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Cash, cash equivalents and restricted cash $ 441.9 $ 549.6 $ 376.8 $ 481.2
Net cash provided by (used in) operating activities 513.2 420.7    
Investing activities        
Purchases of property, plant and equipment (391.8) (278.7)    
Proceeds from sale of property, plant and equipment 3.2 1.7    
Purchase buyouts of leased equipment (0.5) (12.6)    
Proceeds from sale of business, net 47.1 5.9    
Acquisition of business, net of cash acquired (1.3) (895.5)    
Intercompany Activity - Investing 0.0      
Net cash used in investing activities (343.3) (1,179.2)    
Financing activities        
Net debt activity (86.7) 913.5    
Debt issuance costs (6.9) (90.8)    
Employee stock option exercises 0.0 0.9    
Purchase of treasury stock (3.7) (7.0)    
Purchase of noncontrolling interest (2.2) 0.0    
Intercompany Activity - Financing 0.0 0.0    
Net cash provided by (used in) financing activities (99.5) 816.6    
Effect of exchange rate changes on cash (5.3) 10.3    
Net increase (decrease) in cash, cash equivalents and restricted cash 65.1 68.4    
Holdings [Member]        
Cash, cash equivalents and restricted cash 0.0 0.0 0.0 0.0
Net cash provided by (used in) operating activities 0.0 0.0    
Investing activities        
Purchases of property, plant and equipment 0.0 0.0    
Proceeds from sale of property, plant and equipment 0.0 0.0    
Purchase buyouts of leased equipment 0.0 0.0    
Proceeds from sale of business, net 0.0 0.0    
Acquisition of business, net of cash acquired 0.0 0.0    
Intercompany Activity - Investing 0.0      
Net cash used in investing activities 0.0 0.0    
Financing activities        
Net debt activity 0.0 0.0    
Debt issuance costs 0.0 0.0    
Employee stock option exercises   0.0    
Purchase of treasury stock (3.7) (7.0)    
Purchase of noncontrolling interest 0.0      
Intercompany Activity - Financing 3.7 7.0    
Net cash provided by (used in) financing activities 0.0 0.0    
Effect of exchange rate changes on cash 0.0 0.0    
Net increase (decrease) in cash, cash equivalents and restricted cash 0.0 0.0    
AAM Inc. [Member]        
Cash, cash equivalents and restricted cash 129.2 188.5 91.9 84.3
Net cash provided by (used in) operating activities 240.0 276.4    
Investing activities        
Purchases of property, plant and equipment (51.8) (43.1)    
Proceeds from sale of property, plant and equipment 0.0 0.3    
Purchase buyouts of leased equipment 0.0 (12.6)    
Proceeds from sale of business, net 0.0 7.5    
Acquisition of business, net of cash acquired 0.0 (953.5)    
Intercompany Activity - Investing 0.0      
Net cash used in investing activities (51.8) (1,001.4)    
Financing activities        
Net debt activity (140.3) 926.1    
Debt issuance costs (6.9) (90.8)    
Employee stock option exercises   0.9    
Purchase of treasury stock 0.0 0.0    
Purchase of noncontrolling interest 0.0      
Intercompany Activity - Financing (3.7) (7.0)    
Net cash provided by (used in) financing activities (150.9) 829.2    
Effect of exchange rate changes on cash 0.0 0.0    
Net increase (decrease) in cash, cash equivalents and restricted cash 37.3 104.2    
Guarantor Subsidiaries [Member]        
Cash, cash equivalents and restricted cash 2.7 0.1 0.1 1.6
Net cash provided by (used in) operating activities 103.0 9.0    
Investing activities        
Purchases of property, plant and equipment (121.2) (73.3)    
Proceeds from sale of property, plant and equipment 2.7 0.3    
Purchase buyouts of leased equipment (0.5) 0.0    
Proceeds from sale of business, net 42.7 (1.6)    
Acquisition of business, net of cash acquired 0.0 64.6    
Intercompany Activity - Investing (43.8)      
Net cash used in investing activities (120.1) (10.0)    
Financing activities        
Net debt activity (0.6) (0.5)    
Debt issuance costs 0.0 0.0    
Employee stock option exercises   0.0    
Purchase of treasury stock 0.0 0.0    
Purchase of noncontrolling interest (2.2)      
Intercompany Activity - Financing 22.5 0.0    
Net cash provided by (used in) financing activities 19.7 (0.5)    
Effect of exchange rate changes on cash 0.0 0.0    
Net increase (decrease) in cash, cash equivalents and restricted cash 2.6 (1.5)    
Non-Guarantor Subsidiaries [Member]        
Cash, cash equivalents and restricted cash 310.0 361.0 284.8 395.3
Net cash provided by (used in) operating activities 170.2 135.3    
Investing activities        
Purchases of property, plant and equipment (218.8) (162.3)    
Proceeds from sale of property, plant and equipment 0.5 1.1    
Purchase buyouts of leased equipment 0.0 0.0    
Proceeds from sale of business, net 4.4 0.0    
Acquisition of business, net of cash acquired (1.3) (6.6)    
Intercompany Activity - Investing 43.8      
Net cash used in investing activities (171.4) (167.8)    
Financing activities        
Net debt activity 54.2 (12.1)    
Debt issuance costs 0.0 0.0    
Employee stock option exercises   0.0    
Purchase of treasury stock 0.0 0.0    
Purchase of noncontrolling interest 0.0      
Intercompany Activity - Financing (22.5) 0.0    
Net cash provided by (used in) financing activities 31.7 (12.1)    
Effect of exchange rate changes on cash (5.3) 10.3    
Net increase (decrease) in cash, cash equivalents and restricted cash 25.2 (34.3)    
Consolidation, Eliminations [Member]        
Cash, cash equivalents and restricted cash 0.0 0.0 $ 0.0 $ 0.0
Net cash provided by (used in) operating activities 0.0 0.0    
Investing activities        
Purchases of property, plant and equipment 0.0 0.0    
Proceeds from sale of property, plant and equipment 0.0 0.0    
Purchase buyouts of leased equipment 0.0 0.0    
Proceeds from sale of business, net 0.0 0.0    
Acquisition of business, net of cash acquired 0.0 0.0    
Intercompany Activity - Investing 0.0      
Net cash used in investing activities 0.0 0.0    
Financing activities        
Net debt activity 0.0 0.0    
Debt issuance costs 0.0 0.0    
Employee stock option exercises   0.0    
Purchase of treasury stock 0.0 0.0    
Purchase of noncontrolling interest 0.0      
Intercompany Activity - Financing 0.0 0.0    
Net cash provided by (used in) financing activities 0.0 0.0    
Effect of exchange rate changes on cash 0.0 0.0    
Net increase (decrease) in cash, cash equivalents and restricted cash $ 0.0 $ 0.0