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Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit		$ 0.0	$ 120.6
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item	$ 2.1	$ 10.2
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit	$ 0.0
Impairment of Long-Lived Assets to be Disposed of, Tax Benefit			$ 28.0