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FAIR VALUE MEASUREMENT - Fair values of debt obligations (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 16, 2022 | Dec. 15, 2020 | Jan. 12, 2017
--- | --- | --- | --- | --- | ---
Debt |  |  |  |  |
Debt obligations | $ 1,305.7 | $ 1,573.9 |  |  |
Level 2 |  |  |  |  |
Debt |  |  |  |  |
Debt obligations | $ 1,305.7 | 1,573.9 |  |  |
Term Loan Agreement | Level 2 |  |  |  |  |
Debt |  |  |  |  |
Debt obligations |  | $ 306.3 |  |  |
3.650% Senior Notes due January 2027 |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) | 3.65% | 3.65% | 3.65% |  | 3.65%
3.650% Senior Notes due January 2027 | Level 2 |  |  |  |  |
Debt |  |  |  |  |
Debt obligations | $ 628.5 | $ 623.6 |  |  |
1.625% Senior Notes due December 2030 |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) | 1.625% | 1.625% | 1.625% | 1.625% |
1.625% Senior Notes due December 2030 | Level 2 |  |  |  |  |
Debt |  |  |  |  |
Debt obligations | $ 412.7 | $ 390.7 |  |  |
3.000% Senior Notes due March 2032 |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) | 3.00% | 3.00% | 3.00% |  |
3.000% Senior Notes due March 2032 | Level 2 |  |  |  |  |
Debt |  |  |  |  |
Debt obligations | $ 264.5 | $ 253.3 |  |  |

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