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CONVERTIBLE NOTES - Additional information (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2020 USD ($) | Mar. 31, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) shares $ / shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020
Long-term debt |  |  |  |  |  |  |  |  |
Net proceeds from issuance |  |  |  |  |  |  | $ 0 | $ 1,125,547,000 |
Repayments of debt in cash |  |  |  |  |  |  | 0 | 150,054,000 |
Loss on settlement of convertible notes | $ 50,800,000 | $ 187,700,000 |  |  | $ 0 | $ 0 | $ 0 | 50,819,000 |
Market price (in dollars per share) | $ / shares |  |  |  |  | $ 95.45 |  | $ 95.45 |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  | 1.00% |  |  |  |  |
Net proceeds from issuance |  |  |  | $ 671,100,000 |  |  |  |  |
Notes |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |
Amount issued and sold |  | $ 747,500,000 |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  | 0.375% |  |  |  |  |  |  |
Net proceeds from issuance |  | $ 729,500,000 |  |  |  |  |  |  |
Repurchase price, as percentage of principal amount, if company undergoes change of control |  |  |  |  |  |  | 100 |  |
January 2018 Notes |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |
Amount issued and sold |  |  |  | $ 690,000,000.0 |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  | 1.00% |  |  |  |  |
June 2018 Notes |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |
Amount issued and sold |  |  | $ 218,500,000 |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  | 1.00% |  |  |  |  |  |
Net proceeds from issuance |  |  | $ 225,300,000 |  |  |  |  |  |
2025 notes |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  | 1.00% |  | 1.00% |  | 1.00%
Repayments of debt in cash | 150,100,000 |  |  |  |  |  |  |  |
Repayments of debt |  | 493,400,000 |  |  |  |  |  |  |
Amount used to pay off interest accrued | 100,000 | 700,000 |  |  |  |  |  |  |
Loss on settlement of convertible notes |  |  |  |  |  |  |  | $ 42,900,000 |
Amount of debt extinguished | 100,000,000.0 |  |  |  |  |  |  |  |
Conversion rate, number of shares to be issued per $1,000 of principal amount (in shares) |  |  |  |  |  |  | 0.1326 |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 75.43 |  | $ 75.43 |  |
Convertible debt, if-converted (in shares) | shares |  |  |  |  |  |  | 4.2 |  |
If-converted value of debt in excess of principal amount |  |  |  |  |  |  | $ 83,600,000 |  |
Effective interest rate (as a percent) |  |  |  |  | 1.18% | 1.18% | 1.18% | 1.21% |
Interest expense amortization term |  |  |  |  |  |  | 3 years 3 months 18 days |  |
2027 Notes |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  | 0.375% |  | 0.375% |  | 0.375%
Repayments of debt in cash |  | $ 494,100,000 |  |  |  |  |  |  |
Issuance of common stock upon convertible notes settlement (in shares) | shares |  | 2.2 |  |  |  |  |  |  |
Conversion of convertible securities, value issued |  | $ 182,400,000 |  |  |  |  |  |  |
Total consideration |  | $ 676,500,000 |  |  |  |  |  |  |
Conversion rate, number of shares to be issued per $1,000 of principal amount (in shares) |  |  |  |  |  |  | 0.0896 |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 111.66 |  | $ 111.66 |  |
Convertible debt, if-converted (in shares) | shares |  |  |  |  |  |  | 6.7 |  |
Effective interest rate (as a percent) |  |  |  |  | 0.68% | 0.68% | 0.67% | 0.68% |
Interest expense amortization term |  |  |  |  |  |  | 5 years 5 months 15 days |  |
2028 Notes |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |
Amount issued and sold | $ 1,150,000,000 |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 0.375% |  |  |  | 0.375% |  | 0.375% |  | 0.375%
Net proceeds from issuance | $ 1,130,000,000 |  |  |  |  |  |  |  |
Conversion rate, number of shares to be issued per $1,000 of principal amount (in shares) |  |  |  |  |  |  | 0.0821 |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 121.84 |  | $ 121.84 |  |
Convertible debt, if-converted (in shares) | shares |  |  |  |  |  |  | 9.4 |  |
Effective interest rate (as a percent) |  |  |  |  | 0.64% | 0.64% | 0.64% | 0.63% |
Interest expense amortization term |  |  |  |  |  |  | 6 years 5 months 1 day |  |

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