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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 611.3 $ 894.7
Allowance for doubtful accounts (29.3) (11.4)
Accounts receivable, net 582.0 883.3
Trade [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable 595.0 878.8
Other Credit Derivatives [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 16.3 $ 15.9