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Deferred Income Tax Assets and Liabilities and Valuation Allowances (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2017
Tax Credit Carryforward [Line Items]      
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards $ 220.3   $ 280.0
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards, Not Subject to Expiration 106.0    
Valuation allowance, deferred tax asset, increase (decrease), amount 16.0    
Deferred Tax Assets, Valuation Allowance 183.3   $ 180.4
France      
Tax Credit Carryforward [Line Items]      
Valuation allowance, deferred tax asset, increase (decrease), amount $ 3.1    
China      
Tax Credit Carryforward [Line Items]      
Valuation allowance, deferred tax asset, increase (decrease), amount   $ (5.4)