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Results of Operations by Quarter (Unaudited) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
One-time tax reserves   $ 18.0  
Ownership transfer of certain operational assets   $ 3.0  
Net benefit related to U.S. Tax Reform     $ 29.9
Net increase (decrease) in valuation allowance $ (297.5)    
Europe, Middle East & Africa      
Debt Instrument [Line Items]      
Net increase (decrease) in valuation allowance     $ 25.5