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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Accounts receivable, allowance for doubtful accounts $ 10.7 $ 12.1
Intangible assets, accumulated amortization $ 1,324.8 $ 1,235.8
Limited partners:    
Capital account, units outstanding (in units) 2,092,325,330 2,012,553,024