Goodwill and Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019
Goodwill [Line Items]
Goodwill, Gross	$ 1,463.2	$ 1,465.2
Accumulated goodwill impairment loss	432.4	432.4
Goodwill [Roll Forward]
Beginning balance	1,032.8
Infant and Pet Care divestiture	8.2
Cumulative translation adjustment	(6.2)
Ending balance	1,030.8	1,032.8
Wet Shave
Goodwill [Line Items]
Goodwill, Gross	964.5	960.3
Accumulated goodwill impairment loss	369.0	369.0
Goodwill [Roll Forward]
Beginning balance	591.3
Infant and Pet Care divestiture	0.0
Cumulative translation adjustment	(4.2)
Ending balance	595.5	591.3
Impairment loss		369.0
Sun and Skin Care
Goodwill [Line Items]
Goodwill, Gross	229.5	228.3
Accumulated goodwill impairment loss	2.0	2.0
Goodwill [Roll Forward]
Beginning balance	226.3
Infant and Pet Care divestiture	0.0
Cumulative translation adjustment	(1.2)
Ending balance	227.5	226.3
Feminine Care
Goodwill [Line Items]
Goodwill, Gross	207.8	207.0
Accumulated goodwill impairment loss	0.0	0.0
Goodwill [Roll Forward]
Beginning balance	207.0
Infant and Pet Care divestiture	0.0
Cumulative translation adjustment	(0.8)
Ending balance	207.8	207.0
All Other
Goodwill [Line Items]
Goodwill, Gross	61.4	69.6
Accumulated goodwill impairment loss	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	8.2
Skin Care
Goodwill [Roll Forward]
Impairment loss		2.0
Infant Care
Goodwill [Roll Forward]
Impairment loss		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