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Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Indefinite-lived intangible assets	$ 0.0	$ 78.3

X

- 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

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