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INCOME TAXES - Reconciliation of unrecognized tax benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
INCOME TAXES |  |  |
Unrecognized tax benefits, beginning balance | $ 212.1 | $ 162.1 | $ 138.6
Gross increases on unrecognized tax benefits in prior period |  | 21.8 | 3.4
Gross decreases on unrecognized tax benefits in prior period | (1.5) |  | (0.2)
Gross increases on unrecognized tax benefits in current period | 31.1 | 32.9 | 26.5
Settlements | (2.5) | (3.7) |
Lapse of statute of limitations | (1.7) | (1.0) | (6.2)
Unrecognized tax benefits, ending balance | $ 237.5 | $ 212.1 | $ 162.1

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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 lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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