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INCOME TAXES - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Unrecognized Tax Benefits |  |  |
Unrecognized tax benefits at the beginning of period | $ 43.9 | $ 32.1 | $ 37.6
Gross increases - current year tax positions | 0.8 | 12.9 | 1.4
Gross increases - prior year tax positions | 3.6 | 1.6 | 1.1
Gross decreases - prior year tax positions | (0.2) | (2.0) | (2.8)
Gross decreases - settlements | 0.0 | (0.7) | (5.1)
Gross decreases - statute lapse | 0.0 | 0.0 | (0.1)
Unrecognized tax benefits at end of year | 48.1 | 43.9 | 32.1
Interest and penalties in year-end balance | $ 6.4 | $ 4.1 | $ 3.3

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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