RESTRUCTURING, DIVESTITURES, AND IMPAIRMENTS - Schedule of Impairments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	$ 0.0	$ 3.4	$ 0.0	$ 15.7
Selling, general and administrative expenses (SG&A)
Restructuring Cost and Reserve [Line Items]
Operational optimization	0.0	2.8	0.0	2.8
Asset impairment charges	0.0	0.6	0.0	6.1
Cost of revenue (COR)
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	0.0	0.0	0.0	6.8
North America
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	0.0	0.0	0.0	10.1
North America \| Selling, general and administrative expenses (SG&A)
Restructuring Cost and Reserve [Line Items]
Operational optimization	0.0	0.0	0.0	0.0
Asset impairment charges	0.0	0.0	0.0	4.0
North America \| Cost of revenue (COR)
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	0.0	0.0	0.0	6.1
International
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	0.0	3.4	0.0	5.6
International \| Selling, general and administrative expenses (SG&A)
Restructuring Cost and Reserve [Line Items]
Operational optimization	0.0	2.8	0.0	2.8
Asset impairment charges	0.0	0.6	0.0	2.1
International \| Cost of revenue (COR)
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	$ 0.0	$ 0.0	$ 0.0	$ 0.7

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Publisher FASB
-Name Accounting Standards Codification
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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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