Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 0.3	$ 2.4
Limited partners' units, issued	71,659,385	70,721,563
Limited partners' units, outstanding	71,659,385	70,721,563
Preferred units, issued	71,257,445	71,257,445
Preferred units, outstanding	71,257,445	71,257,445
CMLP
Allowance for doubtful accounts	$ 0.3	$ 2.4

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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