REVENUES - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	May 06, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Capitalized Contract Cost [Line Items]
Unearned revenue, revenue recognized				$ 217.9	$ 147.6
Accounts receivable sold		$ 300.0
Remaining performance obligation		4,547.7		4,547.7
Performance obligation partially satisfied in previous period, revenue recognized		10.0	$ 6.0	26.0	58.0
Revenues		701.3	674.9	2,062.9	1,999.4
Loss from continuing operations before income taxes		$ (28.7)	$ (35.8)	$ (947.4)	$ (200.1)
Basic earnings (loss) per share (in dollars per share)		$ (0.17)	$ (0.31)	$ (10.53)	$ (2.99)
Receivables securitization program, term	3 years
Receivables securitization program, amount	$ 300.0
Receivables securitization program, fees associated with sale		$ 4.5	$ 5.3	$ 13.4	$ 7.4
Change in scope and change in estimated effort to complete contract
Capitalized Contract Cost [Line Items]
Revenues		(7.0)	(4.0)	(13.0)	(25.0)
Loss from continuing operations before income taxes		$ 4.0	$ (2.0)	$ (13.0)	$ (25.0)
Basic earnings (loss) per share (in dollars per share)		$ (0.04)	$ (0.02)	$ (0.14)	$ (0.28)
Minimum
Capitalized Contract Cost [Line Items]
Remaining performance obligation, period		1 year		1 year
Maximum
Capitalized Contract Cost [Line Items]
Remaining performance obligation, period		8 years		8 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Capitalized Contract Cost [Line Items]
Remaining performance obligation, percentage		29.00%		29.00%
Remaining performance obligation, period		12 months		12 months
Sales commission assets
Capitalized Contract Cost [Line Items]
Capitalized assets, amortization		$ 3.0	$ 2.9	$ 8.9	$ 8.5
Deferred contract costs
Capitalized Contract Cost [Line Items]
Capitalized assets, amortization		$ 0.2	$ 0.6	$ 0.6	$ 1.5