SIGNIFICANT ACCOUNTING POLICIES - ACCRUED AND OTHER LIABILITIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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
Payroll and vacation	38.3	34.7
Employee incentives and other benefits	33.9	33.2
Insurance reserves and other related liabilities - short term	17.5	15.6
Multi-employer withdrawal liability - short-term	4.1	4.1
Income tax and other tax related liabilities	1.6	2.2
Other short-term liabilities	12.6	15.7
Total	108.0	105.5
Other long-term liabilities
Multi-employer withdrawal liability	46.5	48.6
Pension and post-retirement liabilities	21.8	17.8
Insurance reserves and other related liabilities	23.8	29.8
Other long-term liabilities	21.6	18.6
Total	$ 113.7	$ 114.8
Customer Relationships | Maximum
Intangible assets
Expected useful lives	21 years