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Segment Reporting - Segment Reporting Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 4,099.7 $ 4,450.6 $ 4,581.1
Cost of services 2,916.0 3,170.6 3,211.5
Gross Profit 1,183.7 1,280.0 1,369.6
Selling, general, and administrative expenses 821.2 844.2 895.0
Amortization of intangible assets 58.1 71.7 65.1
Operating income 304.4 364.1 409.5
Interest expense, net 64.3 66.4 45.9
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 240.1 297.7 363.6
Federal Government Business      
Segment Reporting Information [Line Items]      
Revenues 1,231.0 1,276.2 1,145.4
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 4,099.7 4,450.6 4,581.1
Cost of services 2,916.0 3,170.6 3,211.5
Gross Profit 1,183.7 1,280.0 1,369.6
Other Depreciation and Amortization 34.6 24.6 20.9
Other Expenses 709.3 740.4 783.4
Selling, general, and administrative expenses 743.9 765.0 804.3
Amortization of intangible assets 58.1 71.7 65.1
Operating income 381.7 443.3 500.2
Operating Segments [Member] | Consulting      
Segment Reporting Information [Line Items]      
Revenues 2,359.2 2,371.7 2,105.0
Operating Segments [Member] | Assignment      
Segment Reporting Information [Line Items]      
Revenues 1,740.5 2,078.9 2,476.1
Operating Segments [Member] | Commercial Business      
Segment Reporting Information [Line Items]      
Revenues 2,868.7 3,174.4 3,435.7
Cost of services 1,935.8 2,156.8 2,309.5
Gross Profit 932.9 1,017.6 1,126.2
Other Depreciation and Amortization 29.6 20.3 16.4
Other Expenses 588.3 618.4 667.4
Selling, general, and administrative expenses 617.9 638.7 683.8
Amortization of intangible assets 28.5 34.8 31.3
Operating income 286.5 344.1 411.1
Operating Segments [Member] | Commercial Business | Consulting      
Segment Reporting Information [Line Items]      
Revenues 1,128.2 1,095.5 959.6
Operating Segments [Member] | Commercial Business | Assignment      
Segment Reporting Information [Line Items]      
Revenues 1,740.5 2,078.9 2,476.1
Operating Segments [Member] | Federal Government Business      
Segment Reporting Information [Line Items]      
Revenues 1,231.0 1,276.2 1,145.4
Cost of services 980.2 1,013.8 902.0
Gross Profit 250.8 262.4 243.4
Other Depreciation and Amortization 5.0 4.3 4.5
Other Expenses 121.0 122.0 116.0
Selling, general, and administrative expenses 126.0 126.3 120.5
Amortization of intangible assets 29.6 36.9 33.8
Operating income 95.2 99.2 89.1
Operating Segments [Member] | Federal Government Business | Assignment      
Segment Reporting Information [Line Items]      
Revenues 0.0 0.0 0.0
Corporate Non Segment [Member]      
Segment Reporting Information [Line Items]      
Corporate Expenses $ 77.3 $ 79.2 $ 90.7