GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Intangible Assets By Major Class [Line Items]
Accumulated Amortization	$ 615.7	$ 584.9
Gross Carrying Amount	1,738.1	2,007.3
Net Value	1,122.4	1,422.4
Operating permits
Intangible Assets By Major Class [Line Items]
Carrying amount, indefinite lived intangible assets	84.8	211.1
Tradenames
Intangible Assets By Major Class [Line Items]
Carrying amount, indefinite lived intangible assets	312.9	314.2
Customer relationships
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	1,326.8	1,460.8
Accumulated Amortization	605.5	575.8
Net Value	721.3	885.0
Covenants not-to-compete
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	3.5	4.9
Accumulated Amortization	2.9	3.8
Net Value	0.6	1.1
Tradenames
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	3.5	3.6
Accumulated Amortization	1.2	1.1
Net Value	2.3	2.5
Operating permits
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	6.0	4.1
Accumulated Amortization	5.6	1.6
Net Value	0.4	2.5
Other
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	0.6	8.6
Accumulated Amortization	0.5	2.6
Net Value	$ 0.1	$ 6.0