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SUBSEQUENT EVENTS (Narrative) (Details)		1 Months Ended	12 Months Ended
	Feb. 04, 2020 USD ($)	Feb. 21, 2020 shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Feb. 10, 2020 USD ($)	Feb. 03, 2020 USD ($)	Feb. 02, 2020 USD ($)	May 03, 2018 USD ($)
Subsequent Event [Line Items]
Maximum borrowing capacity								$ 2,200,000,000
Stock repurchased during period (in shares) | shares			0	0
Secured Debt | Term Loan Facility
Subsequent Event [Line Items]
Maximum borrowing capacity								900,000,000.0
Revolving Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity								1,300,000,000
Standby Letters of Credit
Subsequent Event [Line Items]
Maximum borrowing capacity								60,000,000.0
Swingline Loan
Subsequent Event [Line Items]
Maximum borrowing capacity								$ 60,000,000.0
Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity						$ 2,200,000,000
Stock repurchased during period (in shares) | shares		1,438,615
Subsequent Event | Convertible Debt
Subsequent Event [Line Items]
Debt, face amount	$ 575,000,000.0
Debt, interest rate	0.50%
Debt, initial conversion rate	13.5739
Proceeds intended to be used for payment of convertible note hedge transaction costs	$ 59,700,000
Proceeds intended to be used for stock repurchase	100,000,000.0
Proceeds intended to be used to repurchase shares through accelerated share repurchase transaction	92,400,000
Subsequent Event | Convertible Debt | Certain Purchasers
Subsequent Event [Line Items]
Proceeds intended to be used for stock repurchase	$ 7,600,000
Subsequent Event | Secured Debt | Term Loan Facility
Subsequent Event [Line Items]
Maximum borrowing capacity						877,500,000	$ 900,000,000
Subsequent Event | Revolving Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity						1,300,000,000
Debt, repaid principal amount					$ 315,000,000.0
Subsequent Event | Standby Letters of Credit
Subsequent Event [Line Items]
Maximum borrowing capacity						60,000,000
Subsequent Event | Swingline Loan
Subsequent Event [Line Items]
Maximum borrowing capacity						$ 60,000,000

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