INCOME TAXES - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Employment costs	$ 34.2	$ 24.9
Environmental reserves	30.9	29.7
Net operating loss carryforwards	52.8	55.6
Operating leases	16.1	16.6
Research and development	22.0	7.6
Other, net	45.7	36.3
Gross deferred tax assets	201.7	170.7
Valuation allowances	(19.6)	(20.7)
Total deferred tax assets, net of valuation allowances	182.1	150.0
Deferred tax liabilities:
Property, plant and equipment	(47.4)	(47.6)
Goodwill and intangibles	(130.6)	(144.9)
Operating leases	(16.2)	(17.0)
Other, net	(15.0)	(2.4)
Total deferred tax liabilities	(209.2)	(211.9)
Net deferred tax (liabilities) assets	(27.1)	(61.9)
Consolidated Balance Sheets:
Non-current deferred income tax liabilities	(100.6)	(140.0)
Income Tax Contingency [Line Items]
Deferred income taxes	100.6	140.0
Deferred Tax Liabilities Noncurrent
Consolidated Balance Sheets:
Non-current deferred income tax assets	73.5	78.1
Non-current deferred income tax liabilities	(100.6)	(140.0)
Income Tax Contingency [Line Items]
Non-current deferred income tax assets	73.5	78.1
Deferred income taxes	$ 100.6	$ 140.0