Fair Value Measurements (Schedule of Nonrecurring Fair Value Measurements) (Details) - Discontinued Operation Long Lived Asset [Member] - Energy From Waste [Member] - Asset Actions [Member] $ in Millions	6 Months Ended
	Mar. 31, 2016 USD ($)	[1]
Long Lived Assets Held-for-sale [Line Items]
Long-lived assets held for sale, Fair Value	$ 20.0
Long-lived assets held for sale, Total Loss	913.5
Level 1 [Member]
Long Lived Assets Held-for-sale [Line Items]
Long-lived assets held for sale, Fair Value	0.0
Level 2 [Member]
Long Lived Assets Held-for-sale [Line Items]
Long-lived assets held for sale, Fair Value	0.0
Level 3 [Member]
Long Lived Assets Held-for-sale [Line Items]
Long-lived assets held for sale, Fair Value	$ 20.0

[1] As a result of our exit from the Energy-from-Waste business, we assessed the recoverability of assets capable of being marketed on a secondary equipment market using an orderly liquidation valuation resulting in an impairment loss for the difference between the orderly liquidation value and net book value of the assets. For additional information, see Note 2, Discontinued Operations.