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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Property, plant and equipment $ 1.9 $ 1.7
Accrued expenses 27.3 24.0
Stock based compensation 3.5 2.6
Net operating loss, research and development and foreign tax credit carryforwards 25.8 22.6
Goodwill and intangibles 0.9 0.4
Pension benefits 20.2 22.7
Other 0.0 0.8
Gross deferred tax assets 79.6 74.8
Valuation allowance (9.4) (10.6)
Total deferred tax assets 70.2 64.2
Deferred tax liabilities:    
Property, plant and equipment (17.9) (11.3)
Pension benefits (10.3) (13.5)
Goodwill and intangibles (74.6) (77.1)
Other (1.1) (1.2)
Gross deferred tax liabilities (103.9) (103.1)
Net deferred tax liabilities $ (33.7) $ (38.9)