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Investments in Marketable Securities - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Marketable Securities [Line Items]            
Investments in equity securities, fair values   $ 45.0   $ 45.0   $ 447.9
Net unrealized gain (loss)   (2.1) $ 3.6 1.3 $ (21.6)  
Proceeds from maturity of AFS securities   178.4 0.0 280.1 0.0  
Debt securities, net unrealized gain (loss)   0.0 $ (0.8) 0.0 $ (3.5)  
EQT AB (“EQT”)            
Marketable Securities [Line Items]            
Investments in equity securities, fair values           405.1
Remaining shares sold (in shares) 2.6          
Variable Interest Entity, Primary Beneficiary            
Marketable Securities [Line Items]            
Fair value of deconsolidated investment in affiliate, equity securities   $ 17.6   $ 17.6   $ 23.5