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Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Indefinite-lived intangible assets | $ 76.7 | $ 76.9

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- References No definition available. + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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