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Revenue Recognition - Schedule of Product and Market Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net Sales	$ 647.2	$ 392.8	$ 1,775.5	$ 1,340.5
Modern Markets
Disaggregation of Revenue [Line Items]
Net Sales	101.9	81.3	331.8	295.1
Developing Markets
Disaggregation of Revenue [Line Items]
Net Sales	47.6	44.9	142.2	136.2
Distributors Markets
Disaggregation of Revenue [Line Items]
Net Sales	32.6	25.3	81.3	70.7
North America
Disaggregation of Revenue [Line Items]
Net Sales	410.3	216.5	1,075.2	748.1
Latin America
Disaggregation of Revenue [Line Items]
Net Sales	54.8	24.8	145.0	90.4
Americas
Disaggregation of Revenue [Line Items]
Net Sales	465.1	241.3	1,220.2	838.5
International
Disaggregation of Revenue [Line Items]
Net Sales	182.1	151.5	555.3	502.0
Batteries
Disaggregation of Revenue [Line Items]
Net Sales	457.2	350.1	1,398.5	1,204.9
Auto Care
Disaggregation of Revenue [Line Items]
Net Sales	160.8	24.1	289.9	68.9
Lights and Licensing
Disaggregation of Revenue [Line Items]
Net Sales	$ 29.2	$ 18.6	$ 87.1	$ 66.7

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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