Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Accounts receivable, allowance for credit loss, current	$ 0.3	$ 0.5
Accumulated depreciation	4,332.0	3,863.0
Accumulated amortization	$ 795.1	$ 668.8
Members’ equity:
Common units issued (in shares)	484,277,258	489,381,149
Common units outstanding (in shares)	484,277,258	489,381,149
Accounts payable, related parties	$ 1.6	$ 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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