v3.7.0.1
Guarantor Condensed Consolidating Financial Information - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net cash provided by (used for) operating activities $ 318.6 $ 330.0 $ 305.4
Cash flows from investing activities:      
Capital expenditures (194.5) (226.3) (156.4)
Proceeds from sale of fixed assets 0.5 4.0 1.4
Capitalized patent costs (0.2) (0.4) (0.2)
Acquisition of business/Grede Transaction, net of cash acquired (14.0)   (829.7)
Net cash used for investing activities (208.2) (222.7) (984.9)
Cash flows from financing activities:      
Cash dividends (25.1) (18.2) (111.3)
Stock-based compensation activity, net 7.0 1.4  
Other stock activity     (2.4)
Proceeds from stock issuance 9.3 3.0 260.5
Borrowings of short-term debt   14.3 388.8
Repayments of short-term debt   (14.6) (407.4)
Purchases of treasury stock (29.5)    
Borrowings of revolving lines of credit   14.3  
Repayments of revolving lines of credit   (14.6)  
Proceeds of long-term debt   1,326.6 2,658.3
Principal payments of long-term debt (13.2) (1,391.8) (1,952.0)
Other debt, net (1.4) (3.7) (6.8)
Payment of debt issue costs   (0.1) (45.4)
Payment of offering related costs   (0.1) (5.6)
Net cash provided by (used for) financing activities (62.2) (86.2) 776.7
Effect of exchange rates (6.7) (9.4) (8.9)
Net increase in cash and cash equivalents 41.5 11.7 88.3
Cash and cash equivalents:      
Cash and cash equivalents, beginning of year 168.2 156.5 68.2
Net increase in cash and cash equivalents 41.5 11.7 88.3
Cash and cash equivalents, end of year 209.7 168.2 156.5
Parent Company [Member]      
Cash flows from operating activities:      
Net cash provided by (used for) operating activities 5.6 8.6 12.0
Cash flows from investing activities:      
Intercompany activity 42.0 8.3 (6.4)
Net cash used for investing activities 42.0 8.3 (6.4)
Cash flows from financing activities:      
Cash dividends (25.1) (18.2)  
Stock-based compensation activity, net 7.0 1.4  
Purchases of treasury stock (29.5)    
Payment of offering related costs   (0.1) (5.6)
Net cash provided by (used for) financing activities (47.6) (16.9) (5.6)
Issuer [Member]      
Cash flows from operating activities:      
Net cash provided by (used for) operating activities (68.4) (58.6) 2.7
Cash flows from investing activities:      
Capital expenditures (1.6) (2.0)  
Intercompany activity 116.5 134.2 (1,858.6)
Net cash used for investing activities 114.9 132.2 (1,858.6)
Cash flows from financing activities:      
Borrowings of revolving lines of credit   14.3  
Repayments of revolving lines of credit   (14.3)  
Proceeds of long-term debt   1,326.6 1,943.3
Principal payments of long-term debt (13.2) (1,391.6) (10.0)
Payment of debt issue costs   (0.1) (25.2)
Intercompany activity   (10.2)  
Net cash provided by (used for) financing activities (13.2) (75.3) 1,908.1
Net increase in cash and cash equivalents 33.3 (1.7) 52.2
Cash and cash equivalents:      
Cash and cash equivalents, beginning of year 50.5 52.2  
Net increase in cash and cash equivalents 33.3 (1.7) 52.2
Cash and cash equivalents, end of year 83.8 50.5 52.2
Guarantor Subsidiaries [Member]      
Cash flows from operating activities:      
Net cash provided by (used for) operating activities 295.1 319.5 205.5
Cash flows from investing activities:      
Capital expenditures (134.5) (171.7) (116.8)
Proceeds from sale of fixed assets 0.1 3.8 0.5
Capitalized patent costs (0.2) (0.4) (0.2)
Acquisition of business/Grede Transaction, net of cash acquired (14.0)   (812.6)
Net cash used for investing activities (148.6) (168.3) (929.1)
Cash flows from financing activities:      
Cash dividends     (111.3)
Other stock activity     (2.4)
Proceeds from stock issuance     244.8
Borrowings of short-term debt     388.8
Repayments of short-term debt     (405.1)
Repayments of revolving lines of credit   (0.3)  
Proceeds of long-term debt     715.0
Principal payments of long-term debt   (0.2) (1,942.0)
Other debt, net (1.3) (3.0) (6.4)
Payment of debt issue costs     (20.2)
Intercompany activity (155.1) (140.2) 1,865.0
Net cash provided by (used for) financing activities (156.4) (143.7) 726.2
Net increase in cash and cash equivalents (9.9) 7.5 2.6
Cash and cash equivalents:      
Cash and cash equivalents, beginning of year 10.8 3.3 0.7
Net increase in cash and cash equivalents (9.9) 7.5 2.6
Cash and cash equivalents, end of year 0.9 10.8 3.3
Non-Guarantor Subsidiaries [Member]      
Cash flows from operating activities:      
Net cash provided by (used for) operating activities 86.3 60.5 85.2
Cash flows from investing activities:      
Capital expenditures (58.4) (52.6) (39.6)
Proceeds from sale of fixed assets 0.4 0.2 0.9
Acquisition of business/Grede Transaction, net of cash acquired     (17.1)
Net cash used for investing activities (58.0) (52.4) (55.8)
Cash flows from financing activities:      
Proceeds from stock issuance     15.7
Repayments of short-term debt     (2.3)
Other debt, net (0.1) (0.7) (0.4)
Intercompany activity (3.4) 7.9  
Net cash provided by (used for) financing activities (3.5) 7.2 13.0
Effect of exchange rates (6.7) (9.4) (8.9)
Net increase in cash and cash equivalents 18.1 5.9 33.5
Cash and cash equivalents:      
Cash and cash equivalents, beginning of year 106.9 101.0 67.5
Net increase in cash and cash equivalents 18.1 5.9 33.5
Cash and cash equivalents, end of year 125.0 106.9 101.0
Consolidation, Eliminations [Member]      
Cash flows from investing activities:      
Intercompany activity (158.5) (142.5) 1,865.0
Net cash used for investing activities (158.5) (142.5) 1,865.0
Cash flows from financing activities:      
Intercompany activity 158.5 142.5 (1,865.0)
Net cash provided by (used for) financing activities $ 158.5 $ 142.5 $ (1,865.0)