Revenue Recognition - Schedule of Product and Market Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net Sales	$ 736.8	$ 571.9
Modern Markets
Disaggregation of Revenue [Line Items]
Net Sales	142.8	127.4
Developing Markets
Disaggregation of Revenue [Line Items]
Net Sales	51.2	49.7
Distributors Markets
Disaggregation of Revenue [Line Items]
Net Sales	28.3	21.3
North America
Disaggregation of Revenue [Line Items]
Net Sales	453.7	341.0
Latin America
Disaggregation of Revenue [Line Items]
Net Sales	60.8	32.5
Americas
Disaggregation of Revenue [Line Items]
Net Sales	514.5	373.5
International
Disaggregation of Revenue [Line Items]
Net Sales	222.3	198.4
Batteries
Disaggregation of Revenue [Line Items]
Net Sales	621.9	521.9
Auto Care
Disaggregation of Revenue [Line Items]
Net Sales	78.7	20.5
Lights and Licensing
Disaggregation of Revenue [Line Items]
Net Sales	$ 36.2	$ 29.5