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Income Taxes - Deferred Income Tax Assets and Liabilities and Valuation Allowances Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Tax Credit Carryforward [Line Items]      
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards $ 320.2 $ 258.8  
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards, Not Subject to Expiration 107.7    
Valuation allowance, deferred tax asset, increase (decrease), amount 14.5 25.4 $ 16.0
Deferred Tax Assets, Valuation Allowance 208.0 196.0  
United States      
Tax Credit Carryforward [Line Items]      
Valuation allowance, deferred tax asset, increase (decrease), amount $ 5.3    
Foreign Tax Authority [Member]      
Tax Credit Carryforward [Line Items]      
Valuation allowance, deferred tax asset, increase (decrease), amount   $ 12.8 $ 3.1