Discontinued Operations (Summary of Carrying Amount of Major Classes of Assets and Liabilities Related to AFI) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Total current assets discontinued operations		$ 381.2
Total non-current assets of discontinued operations		493.1
Total assets	$ 1,758.0	2,687.2
Current liabilities:
Total current liabilities		149.3
Total non-current liabilities of discontinued operations		154.3
AFI [Member]
Current assets:
Cash and cash equivalents		35.5
Accounts and notes receivable, net		70.0
Inventories, net		242.8
Deferred income taxes		5.7
Other current assets		27.2
Total current assets discontinued operations		381.2
Property, plant, and equipment, less accumulated depreciation and amortization		448.2
Intangible assets, net		42.5
Deferred income taxes		1.5
Other non-current assets		0.9
Total non-current assets of discontinued operations		493.1
Total assets		874.3
Current liabilities:
Accounts payable and accrued expenses		149.3
Total current liabilities		149.3
Long-term debt, less current installments		10.0
Postretirement benefit liabilities		85.2
Pension benefit liabilities		45.5
Other long-term liabilities		6.3
Deferred income taxes		7.3
Total non-current liabilities of discontinued operations		154.3
Total liabilities of discontinued operations		$ 303.6