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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Deferred Tax Liabilities    
Depreciable and amortizable property $ (882.4) $ (764.2)
Investments (174.4) (170.6)
Leases (53.4) (48.0)
Other (13.0) (12.0)
Total deferred tax liabilities (1,123.2) (994.8)
Deferred Tax Assets    
Net operating loss carryforwards 87.8 68.3
Deferred compensation 78.6 87.2
Tax credit carryforwards 36.0 35.1
Interest expense carryforwards 39.8 43.1
Accrued expenses 15.4 2.1
Leases 59.7 54.7
Other 36.2 39.7
Total deferred tax assets 353.5 330.2
Valuation allowance (47.6) (38.4)
Deferred tax assets, net of valuation allowance 305.9 291.8
Net deferred tax liabilities $ (817.3) $ (703.0)