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Business Combinations Business Combinations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 06, 2017
Mar. 01, 2017
Business Acquisition [Line Items]                
Goodwill     $ 1,654.3 $ 1,654.3 $ 154.0 $ 154.4    
Payments to Acquire Businesses, Net of Cash Acquired       895.5 5.6 0.0    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest       $ 340.0 $ 299.0 $ 272.7    
USM Mexico Manufacturing LLC [Member]                
Business Acquisition [Line Items]                
Percentage of equity interests acquired               100.00%
Cash consideration   $ 162.5            
Cash and cash equivalents acquired               $ 0.5
Accounts receivable               1.1
Inventories               4.8
Prepaid expenses and other long-term assets               2.4
Property, plant and equipment               38.4
Intangible assets               31.7
Total assets acquired               78.4
Accounts payable               10.8
Accrued expenses and other               2.7
Deferred income tax liabilities               1.2
Net assets acquired               63.7
Goodwill               80.4
Adjustments to Contractual Purchase Price for Capital Equipment               4.9
Adjustment to Contractual Purchase Price - Existing Payable Balance               $ (22.8)
Payments to Acquire Businesses, Net of Cash Acquired   $ 144.1            
Metaldyne Performance Group, Inc. [Member]                
Business Acquisition [Line Items]                
Percentage of equity interests acquired             100.00%  
Cash consideration $ 953.5              
Share consideration 576.7              
Total consideration transferred $ 1,530.2              
Fair value of MPG noncontrolling interests             $ 3.6  
Total fair value of MPG             1,533.8  
Cash and cash equivalents acquired             202.1  
Accounts receivable             403.1  
Inventories             199.0  
Prepaid expenses and other long-term assets             119.9  
Property, plant and equipment             973.0  
Intangible assets             1,223.1  
Total assets acquired             3,120.2  
Accounts payable             287.8  
Accrued expenses and other             137.7  
Deferred income tax liabilities             580.5  
Debt acquired             1,918.7  
Postretirement benefits and other long-term liabilities             54.1  
Net assets acquired             141.4  
Goodwill             1,392.4  
Adjustment to Contractual Purchase Price - Existing Payable Balance             $ (12.4)  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest     $ 93.5