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Goodwill and Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Goodwill [Line Items]
Goodwill, Gross	$ 1,459.2		$ 1,459.2		$ 1,465.2
Accumulated goodwill impairment loss	432.4		432.4		432.4
Goodwill [Roll Forward]
Beginning balance			1,032.8
Infant and Pet Care divestiture			8.2
Cumulative translation adjustment			(2.2)
Ending balance	1,026.8		1,026.8
Impairment charges	0.0	$ 570.0	0.0	$ 570.0
Wet Shave
Goodwill [Line Items]
Goodwill, Gross	963.4		963.4		960.3
Accumulated goodwill impairment loss	369.0		369.0		369.0
Goodwill [Roll Forward]
Beginning balance			591.3
Infant and Pet Care divestiture			0.0
Cumulative translation adjustment			(3.1)
Ending balance	594.4		594.4
Impairment charges				369.0
Sun and Skin Care
Goodwill [Line Items]
Goodwill, Gross	228.4		228.4		228.3
Accumulated goodwill impairment loss	2.0		2.0		2.0
Goodwill [Roll Forward]
Beginning balance			226.3
Infant and Pet Care divestiture			0.0
Cumulative translation adjustment			(0.1)
Ending balance	226.4		226.4
Feminine Care
Goodwill [Line Items]
Goodwill, Gross	206.0		206.0		207.0
Accumulated goodwill impairment loss	0.0		0.0		0.0
Goodwill [Roll Forward]
Beginning balance			207.0
Infant and Pet Care divestiture			0.0
Cumulative translation adjustment			1.0
Ending balance	206.0		206.0
All Other
Goodwill [Line Items]
Goodwill, Gross	61.4		61.4		69.6
Accumulated goodwill impairment loss	61.4		61.4		$ 61.4
Goodwill [Roll Forward]
Beginning balance			8.2
Infant and Pet Care divestiture			8.2
Cumulative translation adjustment			0.0
Ending balance	$ 0.0		$ 0.0
Skin Care
Goodwill [Roll Forward]
Impairment charges				2.0
Infant Care
Goodwill [Roll Forward]
Impairment charges				37.0
Wet Ones
Indefinite-lived Intangible Assets [Line Items]
Indefinite lived intangible impairment				87.0
Diaper Genie
Indefinite-lived Intangible Assets [Line Items]
Indefinite lived intangible impairment				$ 75.0