Investments in Unconsolidated Affiliates - Activity Related to Partnership's Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Schedule Of Equity Method Investments [Line Items]
Balance at beginning of period	$ 131.3
Equity earnings (loss)	(0.2)	$ 5.6
Balance at end of period	$ 134.7

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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