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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets    
Receivable allowances $ 0.8 $ 0.4
Reserves and accruals 0.0 3.8
Inventory and other assets 1.1 0.7
Postretirement and other employee benefits 14.8 15.9
Net operating loss and tax credit carryforwards 93.3 94.1
Investment in subsidiaries 5.6 0.0
Intangibles 60.0 73.6
Other 1.2 4.7
Deferred Tax Assets 176.8 193.2
Less: Valuation allowance (172.1) (182.5)
Net deferred income tax assets 4.7 10.7
Deferred Tax Liabilities    
Net fixed assets (51.9) (40.5)
Reserves and accruals (0.2) 0.0
Investment in subsidiaries 0.0 (9.8)
Derivatives (0.3) (1.3)
Other 0.0 (0.4)
Net deferred income tax liabilities (52.4) (52.0)
Total net deferred income tax liabilities $ (47.7) $ (41.3)