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LONG-TERM DEBT (Details) - USD ($)		12 Months Ended
	Oct. 19, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt		$ 0	$ 0
Interest expense, debt		3,000,000	3,000,000	$ 9,000,000
Amortization of debt issuance costs		900,000	1,000,000	$ 2,000,000
Debt issuance costs, net		2,000,000	3,000,000
Letter of Credit
Debt Instrument [Line Items]
Long-term debt		$ 200,000	$ 200,000
Letter of Credit | 2017 Credit Agreement
Debt Instrument [Line Items]
Revolving credit sub-facility for swing-line loans and issuances of letters of credit	$ 20,000,000
Interest rate increase (in case of default)	2.00%
Revolving Credit Facility | 2017 Credit Agreement
Debt Instrument [Line Items]
Revolving credit sub-facility for swing-line loans and issuances of letters of credit	$ 750,000,000
Term of facility	5 years
Line of credit, covenant compliance, Secured Leverage Ratio	3.50
Line of credit, covenant compliance, Total Leverage Ratio	4.50
Federal Funds Rate | Letter of Credit | 2017 Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
London Interbank Offered Rate (LIBOR) | Letter of Credit | 2017 Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
London Interbank Offered Rate (LIBOR) | Initial Basis Spread | Letter of Credit | 2017 Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
London Interbank Offered Rate (LIBOR) | Initial Basis Spread One Month LIBOR | Letter of Credit | 2017 Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate	0.25%

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Line Of Credit Facility, Covenant Compliance, Secured Leverage Ratio

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Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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