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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 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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