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Supplemental Financial Information (Accounts Receivable, Net) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 894.7us-gaap_AccountsReceivableGrossCurrent $ 884.1us-gaap_AccountsReceivableGrossCurrent
Allowance for doubtful accounts (11.4)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (28.4)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net 883.3us-gaap_ReceivablesNetCurrent 855.7us-gaap_ReceivablesNetCurrent
Trade [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable 878.8us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
869.8us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
Other Credit Derivatives [Member]    
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]    
Accounts receivable $ 15.9us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_OtherCreditDerivativesMember
$ 14.3us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_OtherCreditDerivativesMember