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Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Valuation Allowance [Abstract]    
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset $ 131.2 $ 99.7
Amount of change in deferred tax assets valuation allowance 1.0  
Income Tax Credits [Abstract]    
Undistributed earnings of foreign subsidiaries 1,400.0  
State and Local Jurisdiction    
Net Operating Loss Carryforwards [Abstract]    
Operating loss carryforwards, subject to expiration 96.6  
Foreign Tax Authority    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Subject to Expiration in 1-5 years 0.7  
Net Operating Loss Carryforwards [Abstract]    
Operating loss carryforwards 379.3  
Operating Loss Carryforwards, Subject to Expiration in 10-20 years 1.9  
Operating Loss Carryforwards, Not Subject to Expiration 376.7  
Domestic Tax Authority    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards, Subject to Expiration in 1-5 years 0.0  
Net Operating Loss Carryforwards [Abstract]    
Operating loss carryforwards 30.8  
Operating Loss Carryforwards, Subject to Expiration in 5-10 years 11.9  
Operating Loss Carryforwards, Subject to Expiration in 10-20 years 18.9  
Research Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount 18.7  
Foreign Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount 14.6  
State Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount 16.8  
Tax Year 2019 Through Tax Year 2033 | State Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount 2.4  
After Tax Year 2033 | State Tax Credit Carryforward    
Income Tax Credits [Abstract]    
Tax credit carryforward amount $ 14.4