Segment Information (Tables)

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Summarized financial information concerning reportable segments

Summarized financial information concerning our reportable segments is shown in the following table.

Three Months Ended March 31, 2025	MD&E		IA&C		SC&E		Total
Total revenue	$	902.7	$	861.5	$	558.4	$	2,322.6
Revenue before billable expenses	888.8		780.6		326.9		1,996.3
Base salaries, benefits and tax	500.0		534.2		214.6
Incentive expense	42.9		30.6		11.3
Severance expense	0.7		1.9		0.8
Temporary help	17.1		33.7		10.3
Office and other direct expenses	173.9		103.3		42.0
Depreciation and amortization1	23.6		12.2		3.4
Restructuring Charges2	53.3		55.9		21.7
Other segment items3	15.6		91.2		235.8
Segment EBITA	$	75.6	$	(1.5)	$	18.5	$	92.6
Amortization of acquired intangibles	19.2		0.9		0.3
Capital expenditures	13.0		3.4		0.5

1 Excludes amortization of acquired intangibles.

2 Non-cash lease impairment costs were comprised of $19.1 at MD&E, $18.6 at IA&C and $9.4 at SC&E for the three months ended March 31, 2025.

3 Includes billable expenses and other salaries and related expenses.

Three Months Ended March 31, 2024	MD&E		IA&C		SC&E		Total
Total revenue	$	973.3	$	963.8	$	558.8	$	2,495.9
Revenue before billable expenses	961.3		881.4		340.2		2,182.9
Base salaries, benefits and tax	580.5		571.5		221.1
Incentive expense	29.1		18.9		9.6
Severance expense	22.2		20.3		4.7
Temporary help	24.2		37.2		11.1
Office and other direct expenses	180.2		101.1		40.8
Depreciation and amortization1	26.5		12.4		3.5
Restructuring Charges2	—		0.3		0.3
Other segment items3	17.4		94.2		223.8
Segment EBITA	$	93.2	$	107.9	$	43.9	$	245.0
Amortization of acquired intangibles	19.2		1.0		0.5
Capital expenditures	21.5		2.4		0.8

1 Excludes amortization of acquired intangibles.

2 Non-cash lease impairment costs were comprised of $0.3 at IA&C and $0.3 at SC&E for the three months ended March 31, 2024.

3 Includes billable expenses and other salaries and related expenses.

	March 31, 2025		December 31, 2024
Total assets:
MD&E	$	9,565.4	$	10,248.1
IA&C	4,541.7		4,549.9
SC&E	1,641.4		1,758.9
Corporate and Other	1,377.0		1,768.9
Total	$	17,125.5	$	18,325.8

The following table presents the reconciliation of segment EBITA to Income (Loss) before income taxes.

	Three months ended March 31,
	2025		2024
MD&E EBITA	$	75.6	$	93.2
IA&C EBITA	(1.5)		107.9
SC&E EBITA	18.5		43.9
Total segment EBITA	92.6		245.0
Corporate and Other1	(114.2)		(40.1)
Less: consolidated amortization of acquired intangibles	20.4		20.7
Operating income (loss)	(42.0)		184.2
Total (expenses) and other income	(52.4)		(23.6)
Income (Loss) before income taxes	$	(94.4)	$	160.6

1 Includes restructuring charges of $72.4 for the three months ended March 31, 2025, including non-cash lease impairment costs of $23.1.