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Goodwill and intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]    
Cumulative translation adjustment $ 0.9  
Gross Carrying Amount 685.4 $ 181.3
Trademarks and trade names - indefinite lived 1,292.4 76.9
Total Other intangible assets, net 1,977.8 258.2
Accumulated Amortization 55.6 25.5
Net Carrying Amount 629.8 155.8
Total Other intangible assets, net 1,922.2 232.7
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 61.0 44.3
Accumulated Amortization 8.8 6.1
Net Carrying Amount 52.2 38.2
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 412.5 99.6
Accumulated Amortization 28.2 13.4
Net Carrying Amount 384.3 86.2
Patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 34.5 34.5
Accumulated Amortization 7.6 5.7
Net Carrying Amount 26.9 28.8
Proprietary technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 174.5  
Accumulated Amortization 10.5  
Net Carrying Amount 164.0  
Proprietary Formula    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2.4 2.4
Accumulated Amortization 0.2 0.1
Net Carrying Amount 2.2 2.3
Non-Compete    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 0.5 0.5
Accumulated Amortization 0.3 0.2
Net Carrying Amount 0.2 $ 0.3
International    
Finite-Lived Intangible Assets [Line Items]    
Cumulative translation adjustment (0.2)  
Spectrum Auto Care Acquisition    
Finite-Lived Intangible Assets [Line Items]    
Cumulative translation adjustment $ 0.4