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FAIR VALUE MEASUREMENT - Schedule of fair values of debt obligations (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 15, 2020 | Jan. 12, 2017
--- | --- | --- | --- | ---
Debt |  |  |  |
Debt obligations | $ 1,187.8 | $ 1,319.1 |  |
Level 2 |  |  |  |
Debt |  |  |  |
Debt obligations | 1,187.8 | 1,319.1 |  |
Term Loan Agreement | Level 2 |  |  |  |
Debt |  |  |  |
Debt obligations | $ 50.0 | $ 70.0 |  |
3.650% Senior Notes |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 3.65% | 3.65% | 3.65% | 3.65%
3.650% Senior Notes | Level 2 |  |  |  |
Debt |  |  |  |
Debt obligations | $ 714.9 | $ 744.0 |  |
1.625% Senior Notes |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 1.625% | 1.625% | 1.625% |
1.625% Senior Notes | Level 2 |  |  |  |
Debt |  |  |  |
Debt obligations | $ 466.8 | $ 505.1 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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