UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Accounts receivable, allowance for doubtful accounts	$ 13.8	$ 12.4
Intangible assets, accumulated amortization	$ 1,796.8	$ 1,687.5
Redeemable preferred limited partner interests:
Series A cumulative convertible preferred units outstanding (in units)	50,000
Limited partners:
Common units issued (in units)	2,182,880,979	2,189,226,130
Common units outstanding (in units)	2,182,880,979	2,189,226,130

Amount of allowance for credit loss on accounts receivable, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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