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INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits at beginning of period | $ 27.8 | $ 21.0 | $ 10.8
Gross change for prior period positions | (0.4) |  |
Gross change for prior period positions |  | 7.5 | 8.6
Gross change for current year positions | 0.3 | 0.3 | 0.3
Decrease due to settlements and payments | (3.9) | (0.3) | 0.0
Decrease due to statute expirations | 0.0 | (0.1) | 0.0
Increase due to effect of foreign currency translation | 0.0 | 0.0 | 1.3
Decrease due to effect from foreign currency translation | (0.3) | (0.6) | 0.0
Unrecognized tax benefits at end of period | $ 23.5 | $ 27.8 | $ 21.0

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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=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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