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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 348.1 $ 369.0
Allowance for doubtful accounts (3.4) (23.6)
Accounts receivable, net 344.7 345.4
Trade [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable 301.7 335.4
Other Credit Derivatives [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 46.4 $ 33.6