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Income Taxes Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred Tax Assets, Plant Lease Turnover and Other Exit Costs | $ 3.1 | $ 0.9
Deferred Tax Assets, Employee Benefits Costs | 137.7 | 148.5
Deferred Tax Assets, Inventory | 3.1 | 6.6
Deferred Tax Assets, Property, Plant and Equipment | 437.1 | 450.2
Deferred Tax Assets, Waste Disposition | 0.3 | 1.3
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards | 114.3 | 76.7
Deferred Tax Assets, Accrued Expenses | 8.8 | 5.4
Deferred Tax Assets, Other | 11.9 | 14.6
Deferred Tax Assets, Gross | 716.3 | 704.2
Deferred Tax Assets, Valuation Allowance | (676.4) | (659.6)
Deferred Tax Assets, Net of Valuation Allowance | 39.9 | 44.6
Deferred Tax Liabilities, Intangible Assets | 37.3 | 42.0
Deferred Tax Liabilities, Prepaid Expenses | 2.6 | 2.6
Deferred Tax Liabilities | $ 39.9 | $ 44.6

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