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Investments in Unconsolidated Affiliates - Activity Related to Partnership's Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Schedule Of Equity Method Investments [Line Items]        
Balance at beginning of period     $ 131.3  
Equity earnings (loss) $ 3.0 $ 1.7 6.2 $ 8.7
Balance at end of period $ 138.3   $ 138.3