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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Properties and equipment $ 2.6 $ 0.7
Accrued expenses 27.5 28.6
Stock-based compensation 3.7 3.9
Net operating loss and tax credit carryforwards 21.0 21.6
Goodwill and intangibles 1.7 1.5
Pension benefits 21.8 18.5
Gross deferred tax assets 78.3 74.8
Valuation allowance (8.8) (8.2)
Total deferred tax assets 69.5 66.6
Deferred tax liabilities:    
Properties and equipment (32.5) (24.4)
Pension benefits (12.1) (11.3)
Goodwill and intangibles (67.8) (72.4)
Other (1.2) (1.1)
Gross deferred tax liabilities (113.6) (109.2)
Net deferred tax liabilities $ (44.1) $ (42.6)