Debt - 2019 Convertible Notes Hedges and Warrants (Details) - Net-share-settled Warrants - Common Class A - $ / shares	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Maximum shares called by warrant (shares)	0	14,300,000
Strike price for warrants (usd per share)		$ 20.83
Class of warrant or right outstanding (shares)	0

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

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- Definition

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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- Definition

Number of warrants or rights outstanding.

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