DISCONTINUED OPERATIONS - Earnings from Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other expense:
Loss from discontinued operations, net of tax	$ 0.0	$ (9.4)	$ 0.0	$ (69.7)
Discontinued operations, disposed of by sale | Enabling Services segment disposal
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		0.0		106.4
Costs and expenses:
Direct costs, exclusive of depreciation and amortization		0.0		66.4
Selling, general and administrative expenses, exclusive of depreciation and amortization		0.0		25.4
Depreciation and amortization		0.0		1.6
Long-lived and goodwill asset impairments		0.0		24.0
Restructuring and other charges		0.0		0.5
Total costs and expenses		0.0		117.9
Operating loss		0.0		(11.5)
Other expense:
Foreign exchange gain		0.0		0.1
Loss on sale of a business		0.0		(23.2)
Other, net		0.0		0.1
Loss from discontinued operations before income taxes		0.0		(34.5)
Income tax expense		9.4		35.2
Loss from discontinued operations, net of tax		(9.4)		(69.7)
Loss from operations of discontinued component		(9.4)		(46.5)
Loss on disposal of discontinued operations		$ 0.0		$ (23.2)