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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Properties and equipment $ 3.2 $ 3.5
Accrued expenses 40.1 34.8
Stock-based compensation 3.5 3.3
Net operating loss and tax credit carryforwards 11.0 14.0
Goodwill and intangibles 4.9 4.8
Pension benefits 14.5 15.6
Gross deferred tax assets 77.2 76.0
Valuation allowance (0.1) (0.5)
Total deferred tax assets 77.1 75.5
Deferred tax liabilities:    
Properties and equipment (48.6) (40.6)
Pension benefits (12.8) (11.9)
Goodwill and intangibles (62.4) (62.4)
Other (1.9) (1.8)
Gross deferred tax liabilities (125.7) (116.7)
Net deferred tax liabilities $ (48.6) $ (41.2)