SUBSEQUENT EVENT (Details) - USD ($)		1 Months Ended
	Oct. 23, 2020	Oct. 23, 2020	Apr. 30, 2020	Sep. 30, 2020
Subsequent Event [Line Items]
CARES Act, amount received from initial tranche			$ 65,000,000
Secured Receivables Credit Facility | Letter of Credit
Subsequent Event [Line Items]
Credit facility capacity				$ 100,000,000
Senior Notes | 4.70% Senior Notes due April 2021
Subsequent Event [Line Items]
Debt instrument, interest rate				4.70%
Subsequent Event
Subsequent Event [Line Items]
CARES Act, funds decided to be returned		$ 138,000,000
Subsequent Event | Secured Receivables Credit Facility
Subsequent Event [Line Items]
Credit facility capacity	$ 600,000,000	600,000,000
Subsequent Event | Secured Receivables Credit Facility | Highly-rated issuers or LIBOR | Minimum
Subsequent Event [Line Items]
Interest rate in excess of LIBOR	0.825%
Subsequent Event | Secured Receivables Credit Facility | Highly-rated issuers or LIBOR | Maximum
Subsequent Event [Line Items]
Interest rate in excess of LIBOR	0.95%
Subsequent Event | Secured Receivables Credit Facility | Letter of Credit
Subsequent Event [Line Items]
Credit facility capacity	$ 100,000,000	100,000,000
Subsequent Event | Secured Receivables Credit Facility | Loan commitment maturing October 2021
Subsequent Event [Line Items]
Credit facility capacity	250,000,000	250,000,000
Subsequent Event | Secured Receivables Credit Facility | Loan commitment maturing October 2022
Subsequent Event [Line Items]
Credit facility capacity	250,000,000	250,000,000
Subsequent Event | Senior Notes | 4.70% Senior Notes due April 2021 | Redemption Notice
Subsequent Event [Line Items]
Face amount	$ 550,000,000	$ 550,000,000
Debt instrument, interest rate	4.70%	4.70%