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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Properties and equipment $ 3.5 $ 2.8
Accrued expenses 28.7 24.7
Stock-based compensation 3.5 3.3
Net operating loss and tax credit carryforwards 18.0 19.4
Goodwill and intangibles 0.9 1.8
Pension benefits 14.8 15.1
Gross deferred tax assets 69.4 67.1
Valuation allowance (1.0) (5.1)
Total deferred tax assets 68.4 62.0
Deferred tax liabilities:    
Properties and equipment (35.4) (31.2)
Pension benefits (10.1) (9.2)
Goodwill and intangibles (63.1) (64.4)
Other (1.9) (1.9)
Gross deferred tax liabilities (110.5) (106.7)
Net deferred tax liabilities $ (42.1) $ (44.7)