Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2025

Segment Reporting [Abstract]

Segment Revenue, Segment Operating Expenses and Segment Operating Income of our Operating Segments

Segment revenue, segment operating expenses and segment operating income of our operating segments:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2025		2024		2025		2024
Revenue	$	4,037.1	$	3,882.6	$	11,743.1	$	11,366.9
Segment Operating Expenses:
Salary and service costs:
Salary and related costs	$	1,778.5	$	1,846.9	$	5,386.8	$	5,531.1
Third-party service costs	955.6		784.5		2,670.8		2,293.8
Third-party incidental costs	187.4		164.6		542.8		463.8
Total salary and service costs	2,921.5		2,796.0		8,600.4		8,288.7
Occupancy and other costs	322.7		325.6		963.2		953.9
Segment cost of services	3,244.2		3,121.6		9,563.6		9,242.6
Selling, general and administrative expenses	102.7		99.5		291.2		295.8
Depreciation and amortization	60.7		61.4		178.4		181.4
Total segment operating expenses	3,407.6		3,282.5		10,033.2		9,719.8
Segment Operating Income	$	629.5	$	600.1	$	1,709.9	$	1,647.1

Reconciliation of Segment Operating Income to Income Before Income Taxes and Income From Equity Method Investments

Reconciliation of segment operating income to income before income taxes and income from equity method investments:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2025		2024		2025		2024
Segment Operating Income	$	629.5	$	600.1	$	1,709.9	$	1,647.1
Acquisition related costs	60.8		—		160.6		—
Repositioning costs	38.6		—		127.4		57.8
Operating Income	530.1		600.1		1,421.9		1,589.3
Interest Expense	60.4		66.4		182.1		182.9
Interest Income	17.2		26.0		68.8		74.0
Income Before Income Taxes and Income From Equity Method Investments	$	486.9	$	559.7	$	1,308.6	$	1,480.4

Revenue and Long-Lived Assets and Goodwill by Geographic Region

Revenue and long-lived assets and goodwill by geographic region:

	Americas		EMEA		Asia-Pacific
September 30, 2025
Revenue - Three months ended	$	2,371.7	$	1,202.8	$	462.6
Revenue - Nine months ended	$	6,903.9	$	3,501.1	$	1,338.1
Long-lived assets and goodwill	$	8,083.0	$	3,981.7	$	716.5
September 30, 2024
Revenue - Three months ended	$	2,253.7	$	1,144.1	$	484.8
Revenue - Nine months ended	$	6,645.9	$	3,397.0	$	1,324.0
Long-lived assets and goodwill	$	8,181.3	$	3,933.0	$	726.0