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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Assets    
Receivable allowances $ 0.2 $ 3.4
Reserves and accruals 3.9 3.9
Inventory and other assets 2.3 1.7
Postretirement and other employee benefits 20.0 20.6
Derivatives 0.0 5.5
Net operating loss and tax credit carryforwards 104.8 25.9
Investment in subsidiaries 0.0 1.0
Deferred Tax Assets, Goodwill and Intangible Assets 76.6 0.0
Other 0.1 0.8
Deferred income tax assets 207.9 62.8
Less: Valuation allowance (194.8) (33.8)
Net deferred income tax assets 13.1 29.0
Deferred Tax Liabilities    
Net fixed assets (34.4) (72.7)
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates (4.1) 0.0
Other (0.7) (1.5)
Net deferred income tax liabilities (39.2) (74.2)
Total net deferred income tax liabilities $ (26.1) $ (45.2)