DEBT - 2023 Senior Notes (Details) - 5.875% Senior Notes due 2023 - Senior Notes - USD ($) $ in Millions		9 Months Ended
Apr. 16, 2015	Sep. 30, 2021
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.875%	5.875%
Senior notes issued amount	$ 350.0
Redemption price (as a percent)	101.00%	100.00%

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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