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Goodwill and intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 181.3 $ 181.3
Accumulated Amortization 28.7 25.5
Net Carrying Amount 152.6 155.8
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 44.3 44.3
Accumulated Amortization 6.8 6.1
Net Carrying Amount 37.5 38.2
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 99.6 99.6
Accumulated Amortization 15.1 13.4
Net Carrying Amount 84.5 86.2
Patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 34.5 34.5
Accumulated Amortization 6.4 5.7
Net Carrying Amount 28.1 28.8
Proprietary Formula    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2.4 2.4
Accumulated Amortization 0.1 0.1
Net Carrying Amount 2.3 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