Segment Information (Tables)

6 Months Ended

Jun. 30, 2025

Segment Reporting [Abstract]

Summary of Financial Information Concerning Reportable Segments

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

Three Months Ended June 30, 2025	MD&E		IA&C		SC&E		Total
Total revenue	$	957.4	$	949.3	$	630.1	$	2,536.8
Revenue before billable expenses	947.7		860.5		364.5		2,172.7
Base salaries, benefits and tax	487.5		526.4		212.9
Incentive expense	38.4		18.5		7.8
Severance expense	1.1		2.1		0.3
Temporary help	18.3		38.1		11.9
Office and other direct expenses	172.5		108.7		44.0
Depreciation and amortization1	23.8		11.7		3.1
Restructuring charges2	22.4		59.2		7.7
Other segment items3	8.6		100.2		270.2
Segment EBITA	$	184.8	$	84.4	$	72.2	$	341.4
Amortization of acquired intangibles	20.1		0.7		0.3
Capital expenditures	14.6		6.0		0.7

1 Excludes amortization of acquired intangibles.

2 Non-cash lease impairment costs were comprised of $0.7 at MD&E, $20.7 at IA&C and $1.5 at SC&E for the second quarter of June 30, 2025.

3 Includes billable expenses and other salaries and related expenses.

Three Months Ended June 30, 2024	MD&E		IA&C		SC&E		Total
Total revenue	$	1,069.8	$	1,005.0	$	635.2	$	2,710.0
Revenue before billable expenses	1,058.7		914.9		353.5		2,327.1
Base salaries, benefits and tax	570.5		556.3		218.8
Incentive expense	39.6		30.5		12.5
Severance expense	14.2		17.0		4.1
Temporary help	24.0		35.5		10.8
Office and other direct expenses	202.4		111.8		44.2
Depreciation and amortization1	27.0		12.6		3.6
Restructuring charges2	0.3		—		—
Other segment items3	16.4		102.6		287.7
Segment EBITA	$	175.4	$	138.7	$	53.5	$	367.6
Amortization of acquired intangibles	19.1		0.9		0.4
Capital expenditures	17.5		6.5		2.0

1 Excludes amortization of acquired intangibles.

2 Non-cash lease impairment costs were comprised of $0.3 at MD&E for the second quarter of June 30, 2024.

3 Includes billable expenses and other salaries and related expenses.

Six Months Ended June 30, 2025	MD&E		IA&C		SC&E		Total
Total revenue	$	1,858.3	$	1,812.6	$	1,188.5	$	4,859.4
Revenue before billable expenses	1,835.4		1,642.2		691.4		4,169.0
Base salaries, benefits and tax	986.0		1,062.1		427.5
Incentive expense	81.1		49.3		19.1
Severance expense	1.8		4.0		1.1
Temporary help	35.7		71.5		22.2
Office and other direct expenses	346.1		212.3		86.0
Depreciation and amortization1	47.5		23.8		6.5
Restructuring charges2	76.3		114.5		29.4
Other segment items3	23.6		192.0		506.0
Segment EBITA	$	260.2	$	83.1	$	90.7	$	434.0
Amortization of acquired intangibles	39.3		1.6		0.6
Capital expenditures	27.6		9.4		1.2

1 Excludes amortization of acquired intangibles.

2 Non-cash lease impairment costs were comprised of $19.7 at MD&E, $39.3 at IA&C and $10.9 at SC&E for the first half of June 30, 2025.

3 Includes billable expenses and other salaries and related expenses.

Six Months Ended June 30, 2024	MD&E		IA&C		SC&E		Total
Total revenue	$	2,043.2	$	1,968.7	$	1,194.0	$	5,205.9
Revenue before billable expenses	2,020.1		1,796.2		693.7		4,510.0
Base salaries, benefits and tax	1,150.5		1,128.3		439.9
Incentive expense	68.7		49.4		22.1
Severance expense	36.5		37.2		8.8
Temporary help	49.0		71.9		21.9
Office and other direct expenses	382.7		212.8		85.0
Depreciation and amortization1	53.5		25.0		7.1
Restructuring charges2	0.3		0.3		0.3
Other segment items3	33.9		196.7		511.5
Segment EBITA	$	268.1	$	247.1	$	97.4	$	612.6
Amortization of acquired intangibles	38.4		1.8		0.9
Capital expenditures	39.0		8.9		2.8

1 Excludes amortization of acquired intangibles.

2 Non-cash lease impairment costs were comprised of $0.3 at IA&C, $0.3 at MD&E and $0.3 at SC&E for the first half of June 30, 2024.

3 Includes billable expenses and other salaries and related expenses.

	June 30, 2025		December 31, 2024
Total assets:
MD&E	$	9,508.0	$	10,253.7
IA&C	4,618.2		4,544.3
SC&E	1,729.0		1,758.9
Corporate and Other	1,171.9		1,768.9
Total	$	17,027.1	$	18,325.8

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

	Three months ended June 30,				Six months ended June 30,
	2025		2024		2025		2024
MD&E EBITA	$	184.8	$	175.4	$	260.2	$	268.1
IA&C EBITA	84.4		138.7		83.1		247.1
SC&E EBITA	72.2		53.5		90.7		97.4
Total segment EBITA	341.4		367.6		434.0		612.6
Corporate and other1	(76.6)		(29.0)		(190.8)		(69.1)
Less: consolidated amortization of acquired intangibles	21.1		20.4		41.5		41.1
Operating income	243.7		318.2		201.7		502.4
Total (expenses) and other income	(25.7)		(22.5)		(78.1)		(46.1)
Income before income taxes	$	218.0	$	295.7	$	123.6	$	456.3

1 Includes restructuring charges of $28.7 and $101.1 for the second quarter and first half of June 30, 2025, respectively, including non-cash lease impairment costs of $0.2 and $23.3, respectively.