GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Values of Other Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	$ 1,729.0	$ 2,007.3
Accumulated Amortization	641.6	584.9
Net Value	1,087.4	1,422.4	$ 1,637.7
Operating permits
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Indefinite-lived Intangibles	79.6	211.1
Tradenames
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Indefinite-lived Intangibles	315.3	314.2
Customer relationships
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Amortizable intangibles	1,314.9	1,460.8
Accumulated Amortization	630.2	575.8
Net Value, Amortizable intangibles	684.7	885.0
Covenants not-to-compete
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Amortizable intangibles	3.5	4.9
Accumulated Amortization	3.0	3.8
Net Value, Amortizable intangibles	0.5	1.1
Operating permits
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Amortizable intangibles	11.5	4.1
Accumulated Amortization	6.5	1.6
Net Value, Amortizable intangibles	5.0	2.5
Tradenames
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Amortizable intangibles	3.6	3.6
Accumulated Amortization	1.3	1.1
Net Value, Amortizable intangibles	2.3	2.5
Other
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount, Amortizable intangibles	0.6	8.6
Accumulated Amortization	0.6	2.6
Net Value, Amortizable intangibles	$ 0.0	$ 6.0