Discontinued Operations (Carrying Amount of Accrual) (Details) - Energy From Waste [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal, before-tax	$ 945.7
Noncash expenses	(913.5)
Accrual for actions to dispose of business	32.2
Asset Actions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal, before-tax	913.5
Noncash expenses	(913.5)
Accrual for actions to dispose of business	0.0
Contract Actions/other [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal, before-tax	32.2
Noncash expenses	0.0
Accrual for actions to dispose of business	$ 32.2