Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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+ Details

Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax					$ 70.3	$ (14.3)	$ 0.0
Cash provided by operating activities, discontinued operations					6.7	0.0	$ 0.0
Pre-tax loss from discontinued operations				$ 19.0		$ 19.0
Discontinued operations
Discontinued Operations [Line Items]
Tax benefit related to release of reserves					60.0
EfW \| Discontinued operations
Discontinued Operations [Line Items]
Tax benefit related to release of reserves		$ 8.2			8.2
PMD \| Discontinued operations
Discontinued Operations [Line Items]
Tax benefit related to release of reserves	$ 51.8				$ 51.8
Tax benefit related to settlement			$ 10.3