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INCOME TAXES - Reconciliation of uncertain tax positions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
INCOME TAXES |  |  |
Uncertain tax positions, beginning balance | $ 138.6 | $ 116.7 | $ 102.3
Gross increases on tax positions in prior period | 3.4 | 3.3 | 3.1
Gross decreases on tax positions in prior period | (0.2) |  | (6.3)
Gross increases on tax positions in current period | 26.5 | 24.3 | 18.5
Lapse of statute of limitations | (6.2) | (5.7) | (0.9)
Uncertain tax positions, ending balance | $ 162.1 | $ 138.6 | $ 116.7

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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