DEBT (Narrative) (Details)		3 Months Ended		12 Months Ended
	Feb. 04, 2020 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 09, 2020 USD ($)	Feb. 03, 2020 USD ($)
Debt Instrument [Line Items]
Term loan component of senior credit facility, classified as current				$ 45,000,000	$ 33,750,000
Interest payments, year one				11,000,000
Interest payments, year two				10,300,000
Interest payments, year three				9,400,000
Interest payments, year four				900,000
Cost of call transactions				0	104,248,000	$ 0
Proceeds from warrant transactions				0	44,563,000	$ 0
Long-term convertible securities				564,426,000	474,834,000
Securitization facility, outstanding borrowings, maximum limit				150,000,000
Secured long-term debt, securitization program				$ 112,500,000	$ 112,500,000
Security facility, weighted average interest rate				1.10%	1.30%
Level 2
Debt Instrument [Line Items]
Securitization facility, fair value of amount outstanding				$ 111,800,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 1,300,000,000
Line of credit facility outstanding				$ 31,300,000	$ 97,500,000
Weighted average interest rate on debt				1.40%	1.50%
Revolving Credit Facility | Level 2
Debt Instrument [Line Items]
Line of credit facility, fair value of amount outstanding				$ 31,000,000
Standby Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity								60,000,000
Swingline Loan
Debt Instrument [Line Items]
Maximum borrowing capacity								60,000,000
Senior Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity								2,200,000,000
Capitalized incremental financing costs								4,600,000
Previously capitalized financing costs, written-off			$ 1,200,000
Incremental financing cost expense		$ 3,300,000
Senior Credit Facility | Minimum
Debt Instrument [Line Items]
Line of credit, commitment fee percentage				0.15%
Senior Credit Facility | Maximum
Debt Instrument [Line Items]
Line of credit, commitment fee percentage				0.30%
Senior Credit Facility | Eurodollar Rate | Minimum
Debt Instrument [Line Items]
Interest rates available to the company at its option				1.00%
Senior Credit Facility | Eurodollar Rate | Maximum
Debt Instrument [Line Items]
Interest rates available to the company at its option				2.25%
Senior Credit Facility | Overnight Federal Funds Rate
Debt Instrument [Line Items]
Interest rates available to the company at its option				0.50%
Senior Credit Facility | One-Month Eurodollar Rate
Debt Instrument [Line Items]
Interest rates available to the company at its option				1.00%
Senior Credit Facility | Standby Letters of Credit
Debt Instrument [Line Items]
Line of credit facility outstanding				$ 0
Letters of credit outstanding				1,600,000	$ 1,600,000
Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 877,500,000
Line of credit facility outstanding				$ 843,800,000	$ 877,500,000
Weighted average interest rate on debt				1.40%	1.50%
Term loan component of senior credit facility, classified as current				$ 45,000,000	$ 33,800,000
Term Loan Facility | Secured Debt | Level 2
Debt Instrument [Line Items]
Line of credit facility, fair value of amount outstanding				838,400,000
2025 Notes | Convertible Debt
Debt Instrument [Line Items]
Capitalized incremental financing costs	$ 13,200,000
Convertible notes, aggregate principal amount	$ 575,000,000			575,000,000	575,000,000
Convertible notes, interest rate	0.50%
Debt proceeds, classified as equity at time of offering	$ 104,500,000
Effective interest rate	4.20%
Initial conversion rate	13.5739
Initial conversion price (in dollars per share) | $ / shares	$ 73.67
Maximum selling price of the company's common stock of the conversion price	130.00%
Maximum average conversion value of notes	98.00%
Combination settlement for debt conversion, minimum settled in cash per principal amount							$ 1,000
Redemption price, percentage	100.00%
Warrant strike price (in dollars per share) | $ / shares	$ 113.34
Long-term convertible securities					485,900,000
Unamortized discount					89,100,000
Fair value				640,500,000
Cash interest				2,900,000	$ 2,600,000
Amortization of discount				15,400,000
Interest expense				18,000,000
2025 Notes | Convertible Debt | Call Option
Debt Instrument [Line Items]
Cost of call transactions				104,200,000
Proceeds from warrant transactions				$ 44,500,000
Initial strike price (in dollars per share) | $ / shares	$ 73.67