Divestitures - Schedule of Reconciliation of Loss on Sale of Business as a Result of Divestiture (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Disposal Group Including Discontinued Operation Income Statement Disclosures [Line Items]
Loss on sale of business	[1],[2]	$ (22.3)	$ (355.4)
Solar Products [Member]
Disposal Group Including Discontinued Operation Income Statement Disclosures [Line Items]
Consideration received		30.1
Less: transaction costs		(0.9)
Adjusted consideration received		29.2
Goodwill		(13.6)
Customer relationship intangible asset		(10.0)
Inventory		(27.7)
Property and equipment, net		(0.5)
Other liabilities and assets, net		0.3
Total assets and liabilities divested		(51.5)
Loss on sale of business		$ (22.3)

[1] See Note 4 for additional information.

[2] Unless otherwise noted, amounts include both continuing and discontinued operations.