Discontinued Operations (Carrying Amount of Accrual) (Details) - Energy-from-Waste [Member] - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2016	Mar. 31, 2016	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of business	$ 59.3	$ 945.7	$ 945.7
Noncash expenses	(6.3)		(913.5)
Cash expenditures			(18.6)
Currency translation adjustment			(1.4)
Accrual for actions to dispose of business	65.2		12.2
Asset Actions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of business	6.3		913.5
Noncash expenses	(6.3)		(913.5)
Cash expenditures			0.0
Currency translation adjustment			0.0
Accrual for actions to dispose of business	0.0		0.0
Contract Actions/other [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of business	53.0		32.2
Noncash expenses	0.0		0.0
Cash expenditures			(18.6)
Currency translation adjustment			(1.4)
Accrual for actions to dispose of business	$ 65.2		$ 12.2