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INDEBTEDNESS - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	May 31, 2021
Convertible Senior Notes due 2026 | Convertible notes
Debt Instrument [Line Items]
Face amount of debt		$ 1,440.0
2028 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 1,000.0
2031 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 1,000.0

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