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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Current assets:    
Accounts receivable, allowance for doubtful accounts $ 12.2 $ 12.1
Intangible assets, accumulated amortization $ 1,693.4 $ 1,564.8
Limited partners:    
Common units outstanding (in units) 2,182,661,550 2,161,089,479