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Goodwill and intangible assets - Schedule of Goodwill (Details)
$ in Millions
9 Months Ended
Jun. 30, 2023
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 1,003.1
Cumulative translation adjustment 20.1
Ending balance 1,023.2
Batteries & Lights  
Goodwill [Roll Forward]  
Beginning balance 868.9
Cumulative translation adjustment 20.1
Ending balance 889.0
Auto Care  
Goodwill [Roll Forward]  
Beginning balance 134.2
Cumulative translation adjustment 0.0
Ending balance $ 134.2