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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Accounts receivable, allowance for doubtful accounts $ 11.5 $ 11.5
Intangible assets, accumulated amortization $ 1,815.1 $ 1,735.1
Limited partners:    
Common units outstanding (in units) 2,189,005,978 2,184,869,029