Debt - 2019 Convertible Notes Hedges and Warrants (Details) - Net-share-settled Warrants - Common Class A $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Sep. 30, 2019 USD ($) $ / shares shares
Debt Instrument [Line Items]
Maximum shares called by warrant (shares)	14.3
Strike price for warrants (usd per share) \| $ / shares	$ 20.83
Reclassification of 2019 Convertible Notes Warrants to liabilities \| $	$ 25.1
Warrants outstanding (shares)	8.8

Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 25
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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Number of warrants or rights outstanding.

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