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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Accrued liabilities $ 18.7 $ 34.1
Investment in Joint Venture 5.3 0.0
Stock-based compensation 7.3 8.7
Transaction costs 5.8 0.0
Other 6.7 8.4
Deferred tax assets, gross 43.8 51.2
Valuation allowance (1.3) (0.5)
Total deferred assets 42.5 50.7
Deferred tax liabilities    
Intangibles, net 10.2 17.7
Inventories 12.8 13.0
Property, plant and equipment, net 29.4 45.8
Other 0.3 1.0
Total deferred tax liabilities 52.7 77.5
Net deferred tax liabilities $ 10.2 $ 26.8