IMMATERIAL FINANCIAL RESTATEMENT AND RECLASSIFICATIONS TO PRIOR PERIOD FINANCIAL STATEMENTS - Statements of Cash Flow (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (101.0)	$ (14.0)	$ 30.8	$ 12.5	$ 43.3	$ 29.3	$ (25.2)	$ 186.2
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation and amortization	23.5			23.1	48.6	73.6	98.0	93.6
Stock compensation	15.1			6.7	16.1	27.2	42.7	25.4
Operating lease right-of-use asset expense	6.2			7.8	14.3	20.9	27.4	24.9
Long-lived and goodwill asset impairments				0.0		0.0	0.0	9.8
Deferred income taxes	4.2			(3.6)	(4.5)	(13.3)	(41.6)	(16.5)
Other, net	(12.1)			0.9	6.5	3.5	(1.0)	4.1
Changes in assets and liabilities:
Decrease in accounts receivable and unbilled services, net	40.5			27.3	11.4	(23.1)	(25.6)	(105.0)
Increase in prepaid expenses and other	(25.5)			(19.1)	(17.2)	0.6	(3.4)	(9.1)
Increase (decrease) in accounts payable	(0.9)			20.4	19.9	45.9	55.3	24.8
Increase (decrease) in unearned revenue	26.4			(12.9)	(5.5)	(6.0)	(2.2)	(30.1)
Decrease in accrued expenses and other	(26.0)			(65.1)	15.2	(8.6)	30.6	(125.4)
Net cash used for operating activities	(25.6)			(2.0)	148.1	150.0	168.4	82.7
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(9.3)			(16.2)	(25.8)	(30.9)	(40.3)	(54.4)
Proceeds from sale of assets	0.1			0.0	0.3	8.1	8.5	0.4
Net cash used for investing activities	(9.2)			(16.2)	(25.5)	(22.8)	(31.8)	(54.0)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit facilities	271.0			0.0	0.0	24.0	164.0
Payments on revolving credit facilities	(242.0)			0.0	0.0	(24.0)	(164.0)
Proceeds from term loans					1,061.4	1,061.4	1,061.4
Proceeds from issuance of senior notes					570.0	570.0	570.0
Debt issuance costs					(26.4)	(26.4)	(26.4)
Principal payments of long-term debt	(7.7)			0.0	0.0	(7.7)	(15.4)
Special payment to Former Parent					(1,595.0)	(1,595.0)	(1,595.0)
Net transfers to Former Parent	0.0			24.5	(135.4)	(135.4)	(135.4)	(6.3)
Net cash provided by financing activities	21.3			24.5	(125.4)	(133.1)	(140.8)	(6.3)
Effect of exchange rate changes on cash and cash equivalents	(2.3)			1.5	1.3	(0.7)	2.4	(6.6)
Net change in cash and cash equivalents	(15.8)			7.8	(1.5)	(6.6)	(1.8)	15.8
Cash and cash equivalents at beginning of period	108.6	108.9	118.2	110.4	110.4	110.4	110.4	94.6
Cash and cash equivalents at end of period	92.8	103.8	108.9	118.2	108.9	103.8	108.6	110.4
As Previously Reported
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)		(13.1)	28.3	17.4	45.7	32.6	(3.4)	192.9
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation and amortization				22.8	47.9	72.5	96.4	92.7
Stock compensation				6.7	16.1	27.2	42.7	25.4
Operating lease right-of-use asset expense				7.8	14.3	20.9	27.4	24.9
Long-lived and goodwill asset impairments				0.0		0.0	0.0	9.8
Deferred income taxes				(3.7)	(3.9)	(12.7)	(40.5)	(16.5)
Other, net				0.8	6.5	3.5	(1.0)	4.1
Changes in assets and liabilities:
Decrease in accounts receivable and unbilled services, net				26.8	7.8	(26.6)	(28.8)	(105.0)
Increase in prepaid expenses and other				(18.6)	(16.0)	(3.1)	(2.0)	(12.2)
Increase (decrease) in accounts payable				20.9	23.7	47.3	51.1	22.4
Increase (decrease) in unearned revenue				(13.9)	(7.7)	(6.5)	(3.4)	(32.5)
Decrease in accrued expenses and other				(63.6)	19.8	(0.1)	28.9	(118.5)
Net cash used for operating activities				3.4	154.2	155.0	167.4	87.5
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures				(16.2)	(25.8)	(30.9)	(40.3)	(54.4)
Proceeds from sale of assets				0.0	0.3	8.1	8.5	0.4
Net cash used for investing activities				(16.2)	(25.5)	(22.8)	(31.8)	(54.0)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit facilities					0.0	24.0	164.0
Payments on revolving credit facilities					0.0	(24.0)	(164.0)
Proceeds from term loans					1,061.4	1,061.4	1,061.4
Proceeds from issuance of senior notes					570.0	570.0	570.0
Debt issuance costs					(26.4)	(26.4)	(26.4)
Principal payments of long-term debt					0.0	(7.7)	(15.4)
Special payment to Former Parent					(1,595.0)	(1,595.0)	(1,595.0)
Net transfers to Former Parent				19.9	(136.7)	(136.7)	(133.6)	(8.7)
Net cash provided by financing activities				19.9	(126.7)	(134.4)	(139.0)	(8.7)
Effect of exchange rate changes on cash and cash equivalents				1.1	0.3	(2.3)	0.0	(7.4)
Net change in cash and cash equivalents				8.2	2.3	(4.5)	(3.4)	17.4
Cash and cash equivalents at beginning of period	108.6	114.3	120.2	112.0	112.0	112.0	112.0	94.6
Cash and cash equivalents at end of period		107.5	114.3	120.2	114.3	107.5	108.6	112.0
Adjustments
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)		(0.9)	2.5	(4.9)	(2.4)	(3.3)	(21.8)	(6.7)
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Depreciation and amortization				0.3	0.7	1.1	1.6	0.9
Stock compensation				0.0	0.0	0.0	0.0	0.0
Operating lease right-of-use asset expense				0.0	0.0	0.0	0.0	0.0
Long-lived and goodwill asset impairments				0.0		0.0	13.4	0.0
Deferred income taxes				0.1	(0.6)	(0.6)	(1.1)	0.0
Other, net				0.1	0.0	0.0	0.0	0.0
Changes in assets and liabilities:
Decrease in accounts receivable and unbilled services, net				0.5	3.6	3.5	3.2	0.0
Increase in prepaid expenses and other				(0.5)	(1.2)	3.7	(1.4)	3.1
Increase (decrease) in accounts payable				(0.5)	(3.8)	(1.4)	4.2	2.4
Increase (decrease) in unearned revenue				1.0	2.2	0.5	1.2	2.4
Decrease in accrued expenses and other				(1.5)	(4.6)	(8.5)	1.7	(6.9)
Net cash used for operating activities				(5.4)	(6.1)	(5.0)	1.0	(4.8)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures				0.0	0.0	0.0	0.0	0.0
Proceeds from sale of assets				0.0	0.0	0.0	0.0	0.0
Net cash used for investing activities				0.0	0.0	0.0	0.0	0.0
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit facilities					0.0	0.0	0.0
Payments on revolving credit facilities					0.0	0.0	0.0
Proceeds from term loans					0.0	0.0	0.0
Proceeds from issuance of senior notes					0.0	0.0	0.0
Debt issuance costs					0.0	0.0	0.0
Principal payments of long-term debt					0.0	0.0	0.0
Special payment to Former Parent					0.0	0.0	0.0
Net transfers to Former Parent				4.6	1.3	1.3	(1.8)	2.4
Net cash provided by financing activities				4.6	1.3	1.3	(1.8)	2.4
Effect of exchange rate changes on cash and cash equivalents				0.4	1.0	1.6	2.4	0.8
Net change in cash and cash equivalents				(0.4)	(3.8)	(2.1)	1.6	(1.6)
Cash and cash equivalents at beginning of period	$ 0.0	(5.4)	(2.0)	(1.6)	(1.6)	(1.6)	(1.6)	0.0
Cash and cash equivalents at end of period		$ (3.7)	$ (5.4)	$ (2.0)	$ (5.4)	$ (3.7)	0.0	(1.6)
As Restated
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Long-lived and goodwill asset impairments							$ 13.4	$ 9.8

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