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Debt - 2023 Note Hedge (Details) shares in Millions	Nov. 30, 2018 purchaser shares
Debt Instrument [Line Items]
Number of Initial purchasers | purchaser	2
Senior Convertible Notes due 2023 | Designated as hedging instrument | Senior Notes
Debt Instrument [Line Items]
Stock issued upon conversion of senior notes (in shares) | shares	20.7

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