Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Allowance for bad debt	$ 0.3	$ 0.5
Property and equipment, accumulated depreciation	4,215.7	3,863.0
Intangible assets, accumulated amortization	$ 763.2	$ 668.8
Members’ equity:
Common units issued (in shares)	487,951,939	489,381,149
Common units outstanding (in shares)	489,381,149	487,951,939
Accounts payable to related party	$ 1.9	$ 1.0

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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