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Income Taxes - Summary of Tax Effects of Temporary Differences (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets    
Federal foreign tax credit carryforward $ 47.9 $ 46.8
State net operating loss carryforwards 5.1 5.7
Tax basis goodwill and intangibles 218.3 240.3
Depreciation and amortization 76.3 61.7
Deferred restricted common unit compensation 83.1 36.5
Lease liabilities 114.7 116.1
Accrued compensation 1,045.8 926.2
Other 106.6 109.8
Deferred tax assets before valuation allowance 1,697.8 1,543.1
Valuation allowance (62.7) (62.8)
Total deferred tax assets 1,635.1 1,480.3
Deferred tax liabilities    
Unrealized appreciation on investments 1,517.3 1,333.8
Lease right-of-use assets 87.4 87.7
Basis difference in investments 100.2 48.8
Other 39.6 38.8
Total deferred tax liabilities 1,744.5 1,509.1
Net deferred tax assets (liabilities) (109.4) (28.8)
Amount of deferred tax liabilities offset for presentation purposes $ 1,607.5 $ 1,463.8