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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 432.5 $ 611.3
Allowance for doubtful accounts (24.5) (29.3)
Accounts receivable, net 408.0 582.0
Trade [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable 415.8 595.0
Other [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 16.7 $ 16.3