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Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]    
Document Fiscal Year Focus 2016  
Valuation Allowance [Abstract]    
Valuation allowance $ 161.3 $ 127.4
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset 161.3 $ 127.4
Income Tax Credits [Abstract]    
Undistributed earnings of foreign subsidiaries 1,600.0  
State and Local Jurisdiction    
Net Operating Loss Carryforwards [Abstract]    
Operating loss carryforwards, subject to expiration 99.2  
Foreign Tax Authority    
Net Operating Loss Carryforwards [Abstract]    
Operating loss carryforwards 310.0  
Operating loss carryforwards, subject to expiration 2.7  
Operating Loss Carryforwards, Not Subject to Expiration 307.3  
United Kingdom    
Valuation Allowance [Abstract]    
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset 1.6  
Domestic Tax Authority    
Net Operating Loss Carryforwards [Abstract]    
Operating loss carryforwards 128.0  
Operating Loss Carryforwards, Subject to Expiration in 1-5 years 1.1  
Operating Loss Carryforwards, Subject to Expiration in 5-10 years 15.8  
Operating Loss Carryforwards, Subject to Expiration in 10-20 years 111.1  
Research Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount 11.6  
Foreign Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount 1.4  
State Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount 11.6  
Tax Year 2016 Through Tax Year 2031 | State Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount 1.4  
After Tax Year 2031 | State Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount $ 10.2