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DEBT - Senior Notes - 6.000% (Details) - Senior Notes – 6.000% - USD ($) $ in Millions | Oct. 23, 2019 | Sep. 30, 2021 | Dec. 28, 2019 | Oct. 13, 2015
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | $ 412.5 |  |  |
Accrued interest | 0.5 |  |  |
Redemption premium | 12.0 |  |  |
Outstanding principal | $ 400.0 |  |  |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (percent) |  | 6.00% |  | 6.00%
Unamortized debt issuance costs |  |  | $ 3.1 |

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