UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Accounts receivable, allowance for doubtful accounts	$ 11.6	$ 11.5
Intangible assets, accumulated amortization	$ 1,779.3	$ 1,735.1
Limited partners:
Common units outstanding (in units)	2,188,560,672	2,184,869,029

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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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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The number of limited partner units outstanding.

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