INCOME TAXES - DEFERRED TAX ASSETS AND DEFERRED TAX LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Operating lease liabilities	$ 86.9	$ 84.0
Multi-employer withdrawal liabilities	10.2	11.4
Deferred compensation	10.0	12.1
Insurance reserves	6.3	7.8
Other	15.5	21.7
Total deferred tax assets	128.9	137.0
Valuation allowance	(4.5)	(5.0)
Total Deferred tax assets, net of valuation allowance	124.4	132.0
Deferred tax liabilities:
Basis differences for property and equipment	528.8	482.7
Capital Construction Fund	142.0	192.1
Operating lease right of use assets	85.5	83.8
Intangibles	40.8	40.3
Other	29.2	26.5
Total deferred tax liabilities	826.3	825.4
Deferred tax liability, net	$ 701.9	$ 693.4