SIGNIFICANT ACCOUNTING POLICIES - OTHER LIABILITIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Intangible assets
Impairment charges related to finite-lived intangible assets	$ 0.0	$ 0.0	$ 0.0
Impairment charges related to indefinite-lived intangible assets and goodwill for impairment	0.0	0.0	$ 0.0
Accrued and other liabilities
Employee incentives and other benefits	36.6	33.9
Payroll and vacation	36.1	38.3
Insurance reserves and other related liabilities - short term	27.2	17.5
Income tax and other tax related liabilities	8.6	1.6
Deferred revenues	5.5	6.4
Other short-term liabilities	5.1	6.2
Multi-employer withdrawal liability - short-term	4.1	4.1
Total	123.2	108.0
Other long-term liabilities
Multi-employer withdrawal liability	44.2	46.5
Insurance reserves and other related liabilities	25.6	23.8
Pension and post-retirement liabilities	21.3	21.8
Long-term tax liabilities	9.1	8.9
Other long-term liabilities	9.1	12.7
Total	$ 109.3	$ 113.7
Customer Relationships | Maximum
Intangible assets
Expected useful lives	21 years