Background and Basis of Presentation (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018 USD ($) brands country	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) brands country	Jun. 30, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ 9.3	$ 10.6	$ 56.4	$ 45.8
Employee shares withheld for taxes			$ (2.2)	$ (15.6)
Number of brands | brands	25		25
Number of countries in which Edgewell operates | country	50		50
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision			$ 0.0
Deferred tax assets	$ 9.7		$ 9.7