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SIGNIFICANT ACCOUNTING POLICIES - ACCRUED AND OTHER LIABILITIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	28.5	25.7
Employee incentives and other	14.7	19.5
Uninsured risks and related liabilities - short term	12.6	9.9
Multi-employer withdrawal liability - short-term (see Note 12)	10.8	10.8
Deferred revenues	6.9	5.7
Interest on debt	4.9	5.1
Pension and post-retirement liabilities - short term (see Note 11)	3.1	3.0
Other short-term liabilities	4.5	2.2
Total	86.0	81.9
Other long-term liabilities
Pension and post-retirement liabilities (see Note 11)	73.4	79.4
Multi-employer withdrawal liability (see Note 12)	54.8	56.6
Uninsured risks and related liabilities	26.6	27.3
Other long-term liabilities	2.6	14.0
Total	$ 157.4	$ 177.3
Customer Relationships. | Maximum
Intangible assets
Expected useful lives	21 years

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