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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]
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Threshold consecutive trading days | day				5
Threshold percentage of stock price trigger				98.00%

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