Discontinued Operations	9 Months Ended
	Jun. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS Income from discontinued operations, net of tax, was $8.2 and $18.5 for the three and nine months ended 30 June 2021, respectively. In the third quarter of fiscal year 2021, we recorded a net tax benefit of $8.2 upon release of tax liabilities related to uncertain tax positions associated with our former Energy-from-Waste ("EfW") business. These liabilities were established in 2016 and released after expiration of the statute of limitations. Additionally, we recorded a tax benefit of $10.3 in the first quarter of fiscal year 2021 primarily from the settlement of a state tax appeal related to the gain on the sale of our former Performance Materials Division in fiscal year 2017. Our consolidated statement of cash flows for the nine months ended 30 June 2021 includes $6.7 received as part of the settlement.