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Income Taxes - Reconciliation of U.S. Federal Statutory Tax Rate to Company's Effective Tax Rate (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income tax provision        
Effective tax rate   19.80% 17.00% 20.50%
Affiliate Transaction gains $ 133.1 $ 0.0 $ 133.1 $ 641.9
Unrealized gains   $ 3.7 $ 2.6  
EQT AB (“EQT”)        
Income tax provision        
Equity securities, realized gain       43.8
Unrealized gains       $ 57.9
Controlling Interest        
Income tax provision        
Statutory U.S. federal tax rate   21.00% 21.00% 21.00%
State income taxes, net of federal benefit   3.50% 3.50% 3.50%
Foreign operations   (0.10%) (4.10%) (1.70%)
Compensation plans   0.70% 1.10% 0.80%
Change in valuation allowances   (0.50%) (0.10%) 0.30%
Unrecognized tax benefits   0.20% 0.60% 0.40%
BPEA Transaction   0.00% 0.00% (1.00%)
Changes in U.S. tax provision to return   0.50% (0.70%) 0.00%
Other   0.20% (0.40%) 0.00%
Effective tax rate   25.50% 20.90% 23.30%
Non-controlling interests        
Income tax provision        
Effect of income from non-controlling interests   (5.70%) (3.90%) (2.80%)