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DEBT - Schedule of long-term debt (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 15, 2020 | Mar. 22, 2018 | Jan. 12, 2017
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Debt Instrument |  |  |  |  |
Total debt | $ 1,187.8 | $ 1,203.9 |  |  |
Term Loan Agreement |  |  |  |  |
Debt Instrument |  |  |  |  |
Total debt | 49.0 | 68.7 |  |  |
Debt instrument face amount |  |  |  | $ 300.0 |
1.625% Senior Notes |  |  |  |  |
Debt Instrument |  |  |  |  |
Total debt | 492.7 | $ 489.3 |  |  |
Debt instrument face amount | $ 500.0 |  | $ 500.0 |  |
Interest rate (as a percent) | 1.625% | 1.625% | 1.625% |  |
3.650% Senior Notes |  |  |  |  |
Debt Instrument |  |  |  |  |
Total debt | $ 646.1 | $ 645.9 |  |  |
Debt instrument face amount | $ 650.0 |  |  |  | $ 650.0
Interest rate (as a percent) | 3.65% | 3.65% | 3.65% |  | 3.65%
Revolving Credit Agreement |  |  |  |  |
Debt Instrument |  |  |  |  |
Total debt | $ 0.0 |  |  |  |

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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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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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