GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Values of Other Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	$ 2,135.6	$ 2,137.6
Accumulated Amortization	535.9	499.9
Net Value	1,599.7	1,637.7
Operating permits
Intangible Assets By Major Class [Line Items]
Carrying Amount, Indefinite Lived Intangible Assets	212.2	212.5
Tradenames
Intangible Assets By Major Class [Line Items]
Carrying Amount, Indefinite Lived Intangible Assets	313.4	312.3
Customer relationships
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	1,588.5	1,591.5
Accumulated Amortization	527.5	492.0
Net Value	1,061.0	1,099.5
Covenants not-to-compete
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	5.1	5.1
Accumulated Amortization	3.4	3.2
Net Value	1.7	1.9
Tradenames
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	4.2	3.9
Accumulated Amortization	1.3	1.2
Net Value	2.9	2.7
Other
Intangible Assets By Major Class [Line Items]
Gross Carrying Amount	12.2	12.3
Accumulated Amortization	3.7	3.5
Net Value	$ 8.5	$ 8.8