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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, 2017
Dec. 31, 2016
Tax Credit Carryforward [Line Items]    
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards $ 280.0 $ 173.4
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards, Not Subject to Expiration $ 118.2  
NOL and Tax Credit Carryforward, Range of Carryforward Period, Lower End of Range 5 years  
NOL and Tax Credit Carryforward, Range of Carryforward Period, Upper End of Range 20 years  
Deferred Tax Assets, Valuation Allowance $ 180.4 164.8
China    
Tax Credit Carryforward [Line Items]    
Valuation allowance, deferred tax asset, increase (decrease), amount   $ (5.4)