Discontinued Operations (Carrying Amount of Accrual) (Details) - Energy From Waste [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal, before tax	$ 945.7	$ 945.7
Noncash expenses		(913.5)
Cash expenditures		(18.6)
Currency translation adjustment		(1.4)
Accrual for actions to dispose of business		12.2
Asset Impariment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal, before tax	913.5	913.5
Noncash expenses		(913.5)
Cash expenditures		0.0
Currency translation adjustment		0.0
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	32.2
Noncash expenses		0.0
Cash expenditures		(18.6)
Currency translation adjustment		(1.4)
Accrual for actions to dispose of business		$ 12.2