Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 11, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Initial term of campus lease agreement period			5 years
Accumulated other comprehensive losses, net of tax	$ 425.9		$ 425.9	$ 483.4	$ 487.4	$ 495.5
Pension liabilities, including an unfunded pension liability	61.5		61.5		$ 62.1
Income tax (expense) benefit	0.1		1.9	43.4
DLW [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pension liabilities, including an unfunded pension liability		$ 115.0
Income tax (expense) benefit	0.1	$ 43.4	1.9	$ 43.4
Deconsolidation net liability	12.0		12.0				$ 12.9
Assets removed from balance sheet							151.9
Liabilities removed from balance sheet							$ 164.8
Transferring To AFI [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pension benefit liabilities	30.0		30.0
Postretirement benefit liabilities	90.0		90.0
Dividends received	50.0		50.0
Accumulated other comprehensive losses, net of tax	56.8		56.8
Reduction in additional paid-in capital	$ 641.9		$ 641.9