Discontinued Operations (Carrying Amount of Accrual) (Details) - Energy-from-Waste [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2016	Mar. 31, 2016	Jun. 30, 2017	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	$ 59.3	$ 945.7
Noncash expenses			(6.3)	(913.5)
Amount reflected in other noncurrent liabilities			(61.5)
Cash expenditures			(1.4)	(18.6)
Currency translation adjustment			3.4	(1.4)
Accrual for actions to dispose of business			5.7	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		6.3	913.5
Noncash expenses			(6.3)	(913.5)
Amount reflected in other noncurrent liabilities			0.0
Cash expenditures			0.0	0.0
Currency translation adjustment			0.0	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		53.0	32.2
Noncash expenses			0.0	0.0
Amount reflected in other noncurrent liabilities			(61.5)
Cash expenditures			(1.4)	(18.6)
Currency translation adjustment			3.4	(1.4)
Accrual for actions to dispose of business			$ 5.7	$ 12.2