INCOME TAXES - Income Tax Expense Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes
U.S. federal statutory rate (percent)	21.00%	21.00%	21.00%
Taxes computed at U.S. statutory rate	$ 27.1	$ 57.1	$ 52.9
State income taxes, net of federal benefit	1.8	4.6	5.7
Foreign derived intangible income deduction	(10.8)	0.0	0.0
Foreign tax credits	(8.2)	0.0	0.0
Change in valuation allowances	(0.1)	6.4	(63.6)
Tax on undistributed foreign earnings	5.1	5.9	4.7
Changes in uncertain tax positions	1.9	0.2	29.4
Non-deductible goodwill impairment and Kuprion Acquisition research and development charge	20.6	0.0	0.0
One-time impact of amended U.S. tax returns	(37.3)	0.0	0.0
Other, net	(1.9)	(4.6)	(1.7)
Income tax expense	$ 13.0	$ 85.8	$ 48.3
Effective tax rate (percent)	10.00%	32.00%	19.00%
Domestic
Income Taxes
Tax on foreign operations	$ 1.8	$ 3.2	$ 3.9
Foreign
Income Taxes
Tax on foreign operations	$ 13.0	$ 13.0	$ 17.0