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Investments in Unconsolidated Affiliates - Activity Related to Partnership's Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Schedule Of Equity Method Investments [Line Items]        
Balance at beginning of period     $ 146.3  
Equity earnings (loss) $ 2.9 $ 3.4 5.6 $ 3.2
Balance at end of period $ 159.8   $ 159.8