Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Apr. 01, 2016	Dec. 31, 2015	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	$ 419.3				$ 419.3			$ 487.4
Pension liabilities, including an unfunded pension liability	79.6				79.6			$ 62.1
Income tax (benefit)	(14.7)		$ (0.7)		(16.6)	$ (44.1)
AFI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Dividends received							$ 50.0
Income tax (benefit)			7.4		0.1	18.1
AFI [Member] | Transferring To AFI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Defined benefit plan, liability transferred					364.0
Defined benefit plan, net liability transferred					2.0
Defined benefit plan, plan assets transferred					362.0
Accumulated other comprehensive losses, net of tax							56.8
Reduction in additional paid-in capital	660.7				660.7
AFI [Member] | Transferring To AFI [Member] | U.S. Defined Benefit Pension Plan [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Pension benefit liabilities							$ 28.0
Defined benefit plan, net liability transferred	26.0
AFI [Member] | Transferring To AFI [Member] | U.S. Postretirement Benefit Plan [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Defined benefit plan, liability transferred	4.0	$ 90.0
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 (benefit)	(14.7)		$ (0.7)	$ (43.4)	(16.6)	$ (44.1)
Deconsolidation net liability	$ 12.0				$ 12.0				$ 12.9
Assets removed from balance sheet									151.9
Liabilities removed from balance sheet									$ 164.8