Fair Value Measurements (Schedule of Non-recurring Fair Value Measurements Of Long-Lived Assets Held For Sale) (Details) - Energy-from-Waste [Member] - Asset Actions [Member] - USD ($) $ in Millions |
12 Months Ended | ||||
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Sep. 30, 2016 |
Mar. 31, 2016 |
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Discontinued Operation Long Lived Asset [Member] | |||||
Long Lived Assets Held-for-sale [Line Items] | |||||
Long-lived assets held for sale, Fair Value | [1] | $ 20.0 | |||
Long-lived assets held for sale, Total Loss | $ 913.5 | ||||
Level 1 [Member] | Discontinued Operation Long Lived Asset [Member] | |||||
Long Lived Assets Held-for-sale [Line Items] | |||||
Long-lived assets held for sale, Fair Value | [1] | 0.0 | |||
Level 2 [Member] | |||||
Long Lived Assets Held-for-sale [Line Items] | |||||
Long-lived assets held for sale, Fair Value | [1] | 0.0 | |||
Level 3 [Member] | Discontinued Operation Long Lived Asset [Member] | |||||
Long Lived Assets Held-for-sale [Line Items] | |||||
Long-lived assets held for sale, Fair Value | [1] | $ 20.0 | |||
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