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DEBT - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2018 | Dec. 31, 2021 | Sep. 30, 2023 | Feb. 10, 2023 | Mar. 08, 2022 | Sep. 29, 2021 | Apr. 16, 2021 | Dec. 20, 2018
Unsecured Senior Notes due September 29, 2031 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 2.90% |  |
Face amount of debt |  |  |  |  |  | $ 550,000,000 |  |
Unsecured Senior Notes due March 19, 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.65%
Face amount of debt |  |  |  |  |  |  |  | $ 487,100,000
Make-whole premium and accrued interest |  | $ 56,400,000 |  |  |  |  |  |
Write-off of unamortized discount and debt issuance costs |  | $ 3,700,000 |  |  |  |  |  |
2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 750,000,000 |  |  |  |  |  |  |
Increase in aggregate commitments subject to satisfaction of certain commitments from new or existing lenders | $ 300,000,000 |  |  |  |  |  |  |
Commitment fee rate |  |  | 0.125% |  |  |  |  |
Maximum limit of priority debt on net worth | 17.50% |  |  |  |  |  |  |
Borrowings outstanding |  |  | $ 0 |  |  |  |  |
Available borrowing capacity |  |  | $ 750,000,000 |  |  |  |  |
2018 Credit Facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee rate | 0.075% |  |  |  |  |  |  |
2018 Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee rate | 0.20% |  |  |  |  |  |  |
Total debt to total capitalization ratio | 50.00% |  |  |  |  |  |  |
2018 Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 10.00% |  |  |  |  |  |  |
Spread over SOFR |  |  | 1.125% |  |  |  |  |
2018 Credit Facility | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 0.875% |  |  |  |  |  |  |
2018 Credit Facility | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 1.50% |  |  |  |  |  |  |
2018 Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 50.00% |  |  |  |  |  |  |
2018 Credit Facility | One Month Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 100.00% |  |  |  |  |  |  |
2018 Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 0.00% |  |  |  |  |  |  |
2018 Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 50.00% |  |  |  |  |  |  |
2018 Credit Facility | Letters of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 75,000,000 |  |  |  |  |  |  |
2018 Credit Facility, Due November 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 680,000,000 | $ 680,000,000 |  | $ 680,000,000 |
2018 Credit Facility, Due November 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 70,000,000 |  |  |  |  |
Unsecured Standalone Line of Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 95,000,000 |  |  |  |  |
Borrowings outstanding |  |  | 40,000,000 |  |  |  |  |
Letter of Credit - Instrument 1 | Letters of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  | 2,100,000 |  |  |  |  |
Letter of Credit - Instrument 3 | Letters of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  | $ 42,100,000 |  |  |  |  |

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