Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Discontinued Operations [Line Items]
Cash provided by operating activities		$ 0.0	$ 6.7
PMD \| Discontinued operations
Discontinued Operations [Line Items]
Tax benefit related to settlement	$ (10.3)		$ (10.3)

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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+ Details