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Disposal Group, Including Discontinued Operation, Service Agreement Period

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percentage of net sales of a sale on total sales.

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Proceeds from stock purchase agreement deferred.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount of foreign currency translation gain (loss) in the disposal group, including discontinued operation, recognized in the statement of income as a result of the sale or complete or substantially complete liquidation of an investment in a foreign entity.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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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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Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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RESTRUCTURING, DIVESTITURES, AND IMPAIRMENTS - Narrative (Details) - USD ($) $ in Millions			1 Months Ended		3 Months Ended				9 Months Ended
	Aug. 03, 2020	Apr. 06, 2020	Sep. 30, 2020	Oct. 31, 2019	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Cumulative currency translation loss realized through disposition of Argentina operations					$ 87.2			$ 0.0	$ 87.2	$ 0.0
Divestiture losses (gains), net					104.1			83.2	166.2	78.1
Proceeds from divestiture of businesses									$ 421.2	17.8
Communication related services
Restructuring Cost and Reserve [Line Items]
Recognized non-cash impairment charge								42.3		42.3
MEXICO
Restructuring Cost and Reserve [Line Items]
Recognized non-cash impairment charge								40.2		40.2
HSA
Restructuring Cost and Reserve [Line Items]
Service agreement period									7 years
Allocated and deferred transaction proceeds		$ 17.7
TSA
Restructuring Cost and Reserve [Line Items]
Service agreement period									6 months
Allocated and deferred transaction proceeds		1.5
Domestic Environmental Solutions Less Retained Business
Restructuring Cost and Reserve [Line Items]
Sale price for transaction		$ 462.5
Recognized non-cash impairment charge							$ 58.3
Estimated deal costs							$ 10.8
Divestiture losses (gains), net					(8.3)	$ 3.8
Proceeds from divestiture of businesses			$ 9.7
Selling, general and administrative expenses (SG&A)
Restructuring Cost and Reserve [Line Items]
Restructuring charges										5.3
Recognized non-cash impairment charge					2.8			0.9	$ 2.8	0.4
Telephone answering services \| North America
Restructuring Cost and Reserve [Line Items]
Sale price for transaction				$ 36.4
Accrued liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges future payments accrued			$ 1.2		$ 1.2				$ 1.2
International Regulated Waste And Compliance Services
Restructuring Cost and Reserve [Line Items]
Cumulative currency translation loss realized through disposition of Argentina operations	$ 87.2
Divestiture losses (gains), net	112.4
Proceeds from divestiture of businesses	$ 3.9
Percentage Of Net Sales Of Sale On Total Sales	1.00%
International Regulated Waste And Compliance Services \| MEXICO
Restructuring Cost and Reserve [Line Items]
Foreign currency translation gains (losses)				$ (18.0)
International Regulated Waste And Compliance Services \| Disposed of by sale \| United Kingdom
Restructuring Cost and Reserve [Line Items]
Proceeds from divestiture of businesses										14.9
International Regulated Waste And Compliance Services \| Disposed of by sale \| United Kingdom \| Notes Receivable
Restructuring Cost and Reserve [Line Items]
Proceeds from divestiture of businesses										1.3
International Regulated Waste And Compliance Services \| Divestiture Losses (Gains) \| Disposed of by sale
Restructuring Cost and Reserve [Line Items]
Divestiture losses (gains), net										$ (5.1)
North America Regulated Waste And Compliance Services \| Selling, general and administrative expenses (SG&A) \| Customer lists
Restructuring Cost and Reserve [Line Items]
Recognized non-cash impairment charge								$ 1.7