Business Combinations and Divestitures (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 02, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 17, 2020	Sep. 30, 2020	Dec. 17, 2019
Business Acquisition [Line Items]
Goodwill acquired			$ 1,166.9		$ 1,166.9			$ 1,159.7
Acquisition and integration costs	[1]		1.3	$ 0.3	4.6	$ 32.0
Divestiture
Gain on sale of Infant and Pet Care business			0.0	$ 0.0	0.0	(4.1)
Infant and Pet Care | Disposal group, not discontinued operations
Divestiture
Divestiture, sale price									$ 122.5
Proceeds from sale of Infant and Pet Care business							$ 115.0
Proceeds from sale receivable, current									5.0
Disposal, inventory									18.8
Disposal, fixed assets									3.6
Disposal, goodwill and intangible assets									$ 77.8
Gain on sale of Infant and Pet Care business						$ 4.1
Cremo [Member]
Business Acquisition [Line Items]
Acquisition close date		Sep. 02, 2020
Business combinations, net assets acquired		$ 234.6
Business Combinations, working capital and other net assets		11.5
Business combinations, cash acquired		0.7
Business combinations, intangible assets acquired		95.1
Goodwill acquired		$ 128.0
Weighted average useful life of acquired intangible assets		17 years
Cremo [Member] | Selling, general and administrative expenses
Business Acquisition [Line Items]
Acquisition and integration costs			$ 1.3		3.3
Cremo [Member] | Cost of products sold
Business Acquisition [Line Items]
Acquisition and integration costs					$ 1.3

[1] Includes pre-tax SG&A of $1.3 and $3.3 for the three and nine months ended June 30, 2021, respectively, and $0.3 and $32.0 for the three and nine months ended June 30, 2020, respectively, related to acquisition and integration costs. Additionally, Cost of products sold of $1.3 related to the valuation of acquired inventory for the nine months ended June 30, 2021 is included.(3)Includes pre-tax Cost of products sold of $3.9 for the three and nine months ended June 30, 2020 which included incremental costs as a result of the COVID-19 pandemic incurred by the Company related to higher benefit and emergency payments, supplies and freight.