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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Properties and equipment $ 2.8 $ 2.6
Accrued expenses 24.7 27.5
Stock-based compensation 3.3 3.7
Net operating loss and tax credit carryforwards 19.4 21.0
Goodwill and intangibles 1.8 1.7
Pension benefits 15.1 21.8
Gross deferred tax assets 67.1 78.3
Valuation allowance (5.1) (8.8)
Total deferred tax assets 62.0 69.5
Deferred tax liabilities:    
Properties and equipment (31.2) (32.5)
Pension benefits (9.2) (12.1)
Goodwill and intangibles (64.4) (67.8)
Other (1.9) (1.2)
Gross deferred tax liabilities (106.7) (113.6)
Net deferred tax liabilities $ (44.7) $ (44.1)