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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

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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