GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill were as follows:

In millions
	North America		International		Total
Balance as of December 31, 2019	$	2,631.6	$	350.6	$	2,982.2
Divestitures	(182.8)		(4.0)		(186.8)
Changes due to foreign currency fluctuations and other	—		23.9		23.9
Balance as of December 31, 2020	2,448.8		370.5		2,819.3
Acquisition	22.0		—		22.0
Divestitures	—		(6.0)		(6.0)
Changes due to foreign currency fluctuations and other	—		(19.6)		(19.6)
Balance as of December 31, 2021	$	2,470.8	$	344.9	$	2,815.7

Summary of Accumulated Non-Cash Impairment Charges by Segment

Accumulated non-cash impairment charges by segment as of December 31 were as follows:

In millions
	2021		2020
North America	$	421.1	$	421.1
International	175.6		175.6
Total	$	596.7	$	596.7

Carrying Values of Other Intangible Assets

At December 31, the values of other intangible assets were as follows:

In millions
	2021						2020
	Gross Carrying Amount		Accumulated Amortization		Net Value		Gross Carrying Amount		Accumulated Amortization		Net Value
Amortizable intangibles:
Customer relationships	$	1,297.6	$	722.9	$	574.7	$	1,314.9	$	630.2	$	684.7
Covenants not-to-compete	3.5		3.2		0.3		3.5		3.0		0.5
Operating permits	12.1		8.5		3.6		11.5		6.5		5.0
Tradenames	3.6		1.4		2.2		3.6		1.3		2.3
Other	0.6		0.6		—		0.6		0.6		—
Indefinite-lived intangibles:
Operating permits	70.0		—		70.0		79.6		—		79.6
Tradenames	313.7		—		313.7		315.3		—		315.3
Total	$	1,701.1	$	736.6	$	964.5	$	1,729.0	$	641.6	$	1,087.4

Changes in Carrying Amount of Intangible Assets

The changes in the carrying amount of intangible assets were as follows:

In millions
	Total
Balance as of December 31, 2019	$	1,422.4
Divestitures	(209.8)
Impairments	(11.1)
Amortization	(124.9)
Changes due to foreign currency fluctuations	10.8
Balance as of December 31, 2020	1,087.4
Acquisition	20.0
Impairments	(4.6)
Divestitures	(10.9)
Amortization	(117.9)
Changes due to foreign currency fluctuations	(9.5)
Balance as of December 31, 2021	$	964.5

Summary of Finite-lived Intangible Assets

Finite-lived intangible assets are amortized over their estimated useful lives using the straight-line method with each category having weighted average remaining useful lives as follows:

In years
	Estimated Useful Lives	Weighted Average Remaining Useful Lives
Customer relationships	10-25	6.8
Covenants not-to-compete	5	3.6
Operating permits	1-2	1.2
Tradenames	20-40	16.5
Landfill air rights	5-10	2.7

Estimated Intangible Asset Amortization Expense

Our estimated intangible asset amortization expense for each of the next five years is as follows for the years ending December 31:

In millions
2022	$	114.3
2023	111.0
2024	109.8
2025	89.6
2026	28.2