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Investments in Marketable Securities - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Marketable Securities [Line Items]            
Investments in equity securities, fair values   $ 95.8   $ 95.8   $ 447.9
Net unrealized gain (loss)   2.6 $ (18.7) 3.9 $ (24.9)  
Proceeds from maturity of AFS securities   0.0 0.0 101.7 0.0  
Debt securities, net unrealized gain (loss)   0.0 $ (1.9) 0.0 $ (2.7)  
EQT AB (“EQT”)            
Marketable Securities [Line Items]            
Investments in equity securities, fair values   49.9   49.9   405.1
EQT AB (“EQT”) | Subsequent Event            
Marketable Securities [Line Items]            
Remaining shares sold 2.6          
Variable Interest Entity, Primary Beneficiary            
Marketable Securities [Line Items]            
Fair value of deconsolidated investment in affiliate, equity securities   $ 20.6   $ 20.6   $ 23.5