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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
estimate
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Restricted cash $ 0.0 $ 3.8    
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List] us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents    
Property, plant and equipment — net $ 288.9 $ 303.7    
Number of estimates upon which the product liability reserves are based | estimate 2      
Research and development costs $ 35.2 37.9 $ 44.5  
Other income (expense) – net (11.5) (6.8) (7.0)  
Engineering, selling and administrative expenses 251.6 245.3 270.4  
Operating cash flows 513.0 324.9 626.2  
Investing cash flows 534.4 381.3 414.2  
Accounting Standards Update 2017-07        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Other income (expense) – net   7.3 10.3  
Engineering, selling and administrative expenses   7.3 10.3  
Accounting Standards Update 2016-15        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Operating cash flows   402.8 453.9  
Investing cash flows   402.8 $ 453.9  
Accounting Standards Update 2016-02 | Subsequent Event | Minimum        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Increase in right of use assets       $ 49.0
Increase in short-term lease obligations       10.0
Increase in long-term lease obligations       38.0
Accounting Standards Update 2016-02 | Subsequent Event | Maximum        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Increase in right of use assets       53.0
Increase in short-term lease obligations       13.0
Increase in long-term lease obligations       $ 41.0
Assets Leased to Others        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Property, plant and equipment — net $ 49.4 $ 54.3