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Income Taxes - Schedule of Reconciliation of Income Tax Expense (Details) - USD ($) $ in Millions				12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 22, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Taxes [Line Items]
Federal statutory rate	21.00%	35.00%	35.00%	21.00%	21.00%	24.50%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. Statutory federal income tax expense (benefit)				$ 32.6	$ (40.7)	$ (8.8)
Permanent items				14.2	3.7	7.6
Goodwill impairment				2.8	12.2	0.0
Foreign statutory rate vs. U.S. statutory rate				(15.4)	(10.3)	3.0
State income taxes, net of federal effect				4.8	(14.2)	(2.9)
State effective rate change				7.2	4.6	0.0
Tax reform act - U.S. rate change				0.0	0.0	(166.7)
Global intangible low tax income inclusion				6.0	8.6	0.0
Foreign dividend received deduction tax law change				0.0	95.9	0.0
Tax reform act - mandatory repatriation				0.0	(48.0)	73.1
Residual tax on foreign earnings				6.5	1.5	5.9
Change in valuation allowance				9.9	(29.9)	(365.6)
Unrecognized tax (benefit) expense				(7.0)	6.2	(0.1)
Share based compensation adjustments				0.1	4.6	(5.5)
Research and development tax credits				(2.7)	(4.4)	(1.9)
Foreign rate differential on intercompany transfer of intangibles				4.6	0.0	0.0
Partnership outside basis adjustment				5.9	2.1	(8.3)
Return to provision adjustments and other, net				1.4	1.0	7.5
Income tax expense (benefit)				70.9	(7.1)	(462.7)
SB/RH
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. Statutory federal income tax expense (benefit)				18.2	(27.1)	31.9
Permanent items				14.2	3.8	(3.5)
Goodwill impairment				2.8	12.2	0.0
Foreign statutory rate vs. U.S. statutory rate				(15.4)	(10.3)	3.0
State income taxes, net of federal effect				2.3	(11.1)	(1.9)
State effective rate change				7.8	4.6	0.0
Tax reform act - U.S. rate change				0.0	0.0	(181.7)
Global intangible low tax income inclusion				6.0	8.6	0.0
Foreign dividend received deduction tax law change				0.0	95.9	0.0
Tax reform act - mandatory repatriation				0.0	(48.0)	73.1
Residual tax on foreign earnings				6.5	1.5	5.9
Change in valuation allowance				9.8	(29.9)	(0.3)
Unrecognized tax (benefit) expense				(7.0)	6.2	(0.1)
Share based compensation adjustments				0.5	4.6	(0.5)
Research and development tax credits				(2.7)	(4.4)	(1.9)
Foreign rate differential on intercompany transfer of intangibles				4.6	0.0	0.0
Partnership outside basis adjustment				6.5	2.4	0.7
Return to provision adjustments and other, net				4.0	1.7	(1.5)
Income tax expense (benefit)				$ 58.1	$ 10.7	$ (76.8)

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to permanent items; including income that is exempt from income taxes under enacted tax laws and all nondeductible expenses under enacted tax laws.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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