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FAIR VALUE MEASUREMENT - Changes in fair value of Level 3 financial liabilities (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Changes in fair value of level 3 financial liabilities |  |
Balance at the beginning of the period | $ 32.7 | $ 2.2
Realized (gains) losses during period | (2.7) |
Additions | 49.6 | 32.7
Settlements | (9.1) | (2.2)
Balance at the end of the period | 70.5 | 32.7
Contingent consideration liability |  |
Changes in fair value of level 3 financial liabilities |  |
Balance at the beginning of the period | 32.7 | 2.2
Realized (gains) losses during period | (2.7) |
Additions | 49.6 | 32.7
Settlements | (9.1) | (2.2)
Balance at the end of the period | $ 70.5 | $ 32.7

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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