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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 377.2 $ 611.3
Allowance for doubtful accounts (25.1) (29.3)
Accounts receivable, net 352.1 582.0
Trade [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable 355.7 595.0
Other [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 21.5 $ 16.3