CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Accounts receivable, allowance for doubtful accounts	$ 46.5	$ 12.4
Intangible assets, accumulated amortization	$ 1,826.7	$ 1,687.5
Redeemable preferred limited partner interests:
Series A cumulative convertible preferred units outstanding (in units)	50,138
Limited partners:
Common units issued (in units)	2,182,308,958	2,189,226,130
Common units outstanding (in units)	2,182,308,958	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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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