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INCOME TAXES - Reconciliation of Beginning and Ending Amount of Uncertain Tax Positions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns |  |  |
Uncertain gross tax positions, beginning balance | $ 203.1 | $ 150.7 | $ 225.6
Current year tax positions | 86.4 | 55.4 | 37.8
Increase in prior year tax positions | 6.0 | 0.8 | 13.9
Decrease in prior year tax positions | (10.0) | (3.8) | (78.8)
Settlements | (3.7) | 0.0 | (46.5)
Lapse of statutes of limitations | 0.0 | 0.0 | (1.3)
Uncertain gross tax positions, ending balance | $ 281.8 | $ 203.1 | $ 150.7

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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=120406818&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=84230637&loc=SL6600010-109319 + Details
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