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INDEBTEDNESS - Convertible Notes Narrative (Details) - Convertible Debt $ / shares in Units, shares in Millions |  |  |  |  | 9 Months Ended | 12 Months Ended | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2020 USD ($) day $ / shares | Mar. 05, 2020 USD ($) day $ / shares | May 25, 2018 USD ($) day $ / shares | Mar. 06, 2017 USD ($) day $ / shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) shares | Jan. 01, 2021 | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares |  | $ 121.01 | $ 77.85 | $ 22.95 |  |  |  |  |
Carrying amount of equity component |  |  |  |  |  |  |  |  | $ 502,708,000
Issuance costs attributable to the liability component |  |  |  |  |  |  |  |  | 28,958,000
2026 and 2027 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 1,150,000,000 |  |  |  |  |  |  |  |
Conversion rate | 0.003343 |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares | $ 299.13 |  |  |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |  |
Carrying amount of equity component | $ 198,000,000 |  |  |  |  |  |  |  |
Discounts and commissions payable | 17,500,000 |  |  |  |  |  |  |  |
Third party offering costs | 1,000,000 |  |  |  |  |  |  |  |
Issuance costs attributable to the liability component | $ 15,400,000 |  |  |  |  |  |  |  |
Amount of if-converted value in excess of outstanding principal amount |  |  |  |  | $ 0 | $ 0 | $ 0 |  |
2026 and 2027 Notes | Debt Instrument, Conversion Term One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Threshold trading days | day | 20 |  |  |  |  |  |  |  |
Threshold consecutive trading days | day | 30 |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |  |  |  |  |  |
2026 and 2027 Notes | Debt Instrument Conversion Term Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Threshold trading days | day | 5 |  |  |  |  |  |  |  |
Threshold consecutive trading days | day | 5 |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger | 98.00% |  |  |  |  |  |  |  |
2026 Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 575,000,000 |  |  |  |  |  |  |  |
Interest rate | 0.00% |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares | $ 299.13 |  |  |  |  |  |  |  |
Carrying amount of equity component |  |  |  |  |  |  |  |  | $ 85,595,000
Effective interest rate | 3.35% |  |  |  |  |  |  |  | 3.35%
Issuance costs attributable to the liability component |  |  |  |  |  |  |  |  | $ 7,711,000
2026 Convertible Notes | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 0.49% |
2027 Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 575,000,000 |  |  |  |  |  |  |  |
Interest rate | 0.25% |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares | $ 299.13 |  |  |  |  |  |  |  |
Carrying amount of equity component |  |  |  |  |  |  |  |  | $ 109,207,000
Effective interest rate | 3.66% |  |  |  |  |  |  |  | 3.66%
Issuance costs attributable to the liability component |  |  |  |  |  |  |  |  | $ 7,370,000
2027 Convertible Notes | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 0.30% |
2025 Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 1,000,000,000 |  |  |  |  |  |  |
Interest rate |  | 0.125% |  |  |  |  |  |  |
Conversion rate |  | 0.0082641 |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares |  | $ 121.01 |  |  |  |  |  |  |
Redemption price, percentage |  | 100.00% |  |  |  |  |  |  |
Carrying amount of equity component |  | $ 154,600,000 |  |  |  |  |  |  | $ 152,258,000
Effective interest rate |  | 3.81% |  |  |  |  |  |  | 3.81%
Discounts and commissions payable |  | $ 14,300,000 |  |  |  |  |  |  |
Third party offering costs |  | 900,000 |  |  |  |  |  |  |
Issuance costs attributable to the liability component |  | $ 12,800,000 |  |  |  |  |  |  | $ 11,333,000
Amount of if-converted value in excess of outstanding principal amount |  |  |  |  | $ 1,000,000,000 | 1,000,000,000 | 1,000,000,000 |  |
2025 Convertible Notes | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 0.43% |
2025 Convertible Notes | Debt Instrument, Conversion Term One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Threshold trading days | day |  | 20 |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 30 |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 130.00% |  |  |  |  |  |  |
2025 Convertible Notes | Debt Instrument Conversion Term Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Threshold trading days | day |  | 5 |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 5 |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 98.00% |  |  |  |  |  |  |
2023 Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 862,500,000 |  |  |  |  |  |
Interest rate |  |  | 0.50% |  |  |  |  |  |
Conversion rate |  |  | 0.0128456 |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares |  |  | $ 77.85 |  |  |  |  |  |
Carrying amount of equity component |  |  | $ 155,300,000 |  |  |  |  |  | $ 154,019,000
Effective interest rate |  |  | 4.69% |  |  |  |  |  | 4.69%
Discounts and commissions payable |  |  | $ 6,000,000 |  |  |  |  |  |
Third party offering costs |  |  | 800,000 |  |  |  |  |  |
Issuance costs attributable to the liability component |  |  | $ 5,600,000 |  |  |  |  |  | $ 2,474,000
Notes converted |  |  |  |  |  | 220,000,000 |  |  |
Shares issued upon conversion (in shares) | shares |  |  |  |  | 2.8 |  |  |  |
Amount of if-converted value in excess of outstanding principal amount |  |  |  |  | $ 1,300,000,000 | 1,300,000,000 | 1,300,000,000 |  |
2023 Convertible Notes | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 0.66% |
2023 Convertible Notes | Debt Instrument, Conversion Term One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Threshold trading days | day |  |  | 20 |  |  |  |  |  |
Threshold consecutive trading days | day |  |  | 30 |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  | 130.00% |  |  |  |  |  |
2023 Convertible Notes | Debt Instrument Conversion Term Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Threshold trading days | day |  |  | 5 |  |  |  |  |  |
Threshold consecutive trading days | day |  |  | 5 |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  | 98.00% |  |  |  |  |  |
2022 Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 440,000,000 |  |  |  |  |
Interest rate |  |  |  | 0.375% |  |  |  |  |
Conversion rate |  |  |  | 0.0435749 |  |  |  |  |
Conversion price (in USD per share) | $ / shares |  |  |  | $ 22.95 |  |  |  |  |
Carrying amount of equity component |  |  |  | $ 86,200,000 |  |  |  |  | $ 1,629,000
Effective interest rate |  |  |  | 5.34% |  |  |  |  | 5.34%
Discounts and commissions payable |  |  |  | $ 11,000,000 |  |  |  |  |
Third party offering costs |  |  |  | 800,000 |  |  |  |  |
Issuance costs attributable to the liability component |  |  |  | $ 9,400,000 |  |  |  |  | $ 70,000
Notes converted |  |  |  |  | $ 3,900,000 |  | 435,300,000 |  |
Principal payment on conversion of senior notes |  |  |  |  |  |  | $ 219,400,000 |  |
Shares issued upon conversion (in shares) | shares |  |  |  |  | 0.2 |  | 16.3 |  |
Amount of if-converted value in excess of outstanding principal amount |  |  |  |  | $ 44,100,000 | $ 44,100,000 | $ 44,100,000 |  |
2022 Convertible Notes | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 0.93% |
2022 Convertible Notes | Debt Instrument, Conversion Term One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  | 20 |  |  |  |  |
Threshold consecutive trading days | day |  |  |  | 30 |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |  |
2022 Convertible Notes | Debt Instrument Conversion Term Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  | 5 |  |  |  |  |
Threshold consecutive trading days | day |  |  |  | 5 |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 98.00% |  |  |  |  |

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