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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Allowance for doubtful accounts $ 13.9us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 7.5us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated amortization $ 1,246.3us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 1,150.0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Limited partners:    
Capital account, units outstanding (in units) 1,937,324,817us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 1,871,370,016us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding