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INCOME TAXES - Schedule of Reconciliation of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. Statutory federal income tax benefit	$ (2.3)	$ (5.3)	$ (74.4)
Permanent items	13.9	13.6	2.6
Goodwill impairment	0.0	2.8	12.2
Foreign statutory rate vs. U.S. statutory rate	(6.2)	(13.8)	(9.2)
State income taxes, net of federal effect	(8.7)	(0.6)	(17.6)
State effective rate change	2.6	7.2	4.6
UK effective rate change	8.2	0.0	0.0
GILTI	4.9	3.7	2.6
GILTI impact of retroactive law changes	(18.1)	0.0	0.0
Foreign dividend received deduction tax law change	0.0	0.0	95.9
Tax reform act - mandatory repatriation	0.0	0.0	(48.0)
Residual tax on foreign earnings	2.6	6.0	0.2
Change in valuation allowance	(27.1)	9.9	(29.9)
Unrecognized tax expense (benefit)	0.2	(8.5)	7.5
Share based compensation adjustments	(0.7)	0.1	4.3
Research and development tax credits	(2.4)	(1.6)	(3.1)
Foreign rate differential on intercompany transfer of intangibles	0.0	4.6	0.0
Partnership outside basis adjustment	5.5	5.9	2.1
Return to provision adjustments and other, net	1.2	3.3	(1.8)
Income tax (benefit) expense	(26.4)	27.3	(52.0)
SB/RH
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. Statutory federal income tax benefit	(1.6)	(19.7)	(62.4)
Permanent items	13.9	13.6	2.7
Goodwill impairment	0.0	2.8	12.2
Foreign statutory rate vs. U.S. statutory rate	(6.2)	(13.8)	(9.2)
State income taxes, net of federal effect	(8.7)	(3.1)	(14.7)
State effective rate change	2.6	7.8	4.6
UK effective rate change	8.2	0.0	0.0
GILTI	4.9	3.7	2.6
GILTI impact of retroactive law changes	(18.1)	0.0	0.0
Foreign dividend received deduction tax law change	0.0	0.0	95.9
Tax reform act - mandatory repatriation	0.0	0.0	(48.0)
Residual tax on foreign earnings	2.6	6.0	0.2
Change in valuation allowance	(27.1)	9.8	(30.0)
Unrecognized tax expense (benefit)	0.2	(8.5)	7.5
Share based compensation adjustments	0.1	0.5	4.3
Research and development tax credits	(2.4)	(1.6)	(3.1)
Foreign rate differential on intercompany transfer of intangibles	0.0	4.6	0.0
Partnership outside basis adjustment	5.5	5.9	2.4
Return to provision adjustments and other, net	1.1	6.5	(1.1)
Income tax (benefit) expense	$ (25.0)	$ 14.5	$ (36.1)

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