GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in the Carrying Amount of Goodwill, by Segment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Goodwill
Beginning balance	$ 1,167.7	$ 1,112.2
Goodwill acquired during the year		64.4
Currency translation adjustment	5.5	(8.9)
Ending balance	1,173.2	1,167.7
United States
Goodwill
Beginning balance	773.7	709.3
Goodwill acquired during the year		64.4
Currency translation adjustment	0.0	0.0
Ending balance	773.7	773.7
Europe
Goodwill
Beginning balance	62.8	64.2
Goodwill acquired during the year		0.0
Currency translation adjustment	5.5	(1.4)
Ending balance	68.3	62.8
Rest of World
Goodwill
Beginning balance	331.2	338.7
Goodwill acquired during the year		0.0
Currency translation adjustment	0.0	(7.5)
Ending balance	$ 331.2	$ 331.2

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 350
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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