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Segment Reporting - Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues:        
Revenues $ 1,011.4 $ 1,031.0 $ 3,000.3 $ 3,114.7
Costs of services 714.5 730.6 2,134.7 2,217.0
Gross Profit:        
Total Gross Profit 296.9 300.4 865.6 897.7
Selling, general, and administrative expenses 212.2 207.5 643.5 623.3
Amortization of intangible assets 16.8 14.0 48.0 44.2
Operating income 67.9 78.9 174.1 230.2
Interest Expense, Operating and Nonoperating 17.4 16.0 51.0 49.4
Income before income taxes 50.5 62.9 123.1 180.8
Provision for income taxes 12.4 15.4 34.8 48.0
Net income 38.1 47.5 88.3 132.8
Federal Government        
Revenues:        
Revenues 300.1 312.2 908.7 938.7
Operating Segments [Member]        
Revenues:        
Revenues 1,011.4 1,031.0 3,000.3 3,114.7
Costs of services 714.5 730.6 2,134.7 2,217.0
Gross Profit:        
Total Gross Profit 296.9 300.4 865.6 897.7
Other Depreciation and Amortization 11.6 8.6 32.6 25.6
Other Expenses 175.2 179.9 528.8 538.8
Selling, general, and administrative expenses 186.8 188.5 561.4 564.4
Amortization of intangible assets 16.8 14.0 48.0 44.2
Operating income 93.3 97.9 256.2 289.1
Operating Segments [Member] | Assignment        
Revenues:        
Revenues 376.4 433.8 1,140.9 1,332.5
Operating Segments [Member] | consulting [Member]        
Revenues:        
Revenues 635.0 597.2 1,859.4 1,782.2
Operating Segments [Member] | Commercial        
Revenues:        
Revenues 711.3 718.8 2,091.6 2,176.0
Costs of services 475.4 483.0 1,404.6 1,469.1
Gross Profit:        
Total Gross Profit 235.9 235.8 687.0 706.9
Other Depreciation and Amortization 10.2 7.4 28.2 21.9
Other Expenses 147.3 148.5 442.6 446.2
Selling, general, and administrative expenses 157.5 155.9 470.8 468.1
Amortization of intangible assets 10.5 6.6 28.8 22.0
Operating income 67.9 73.3 187.4 216.8
Operating Segments [Member] | Commercial | Assignment        
Revenues:        
Revenues 376.4 433.8 1,140.9 1,332.5
Operating Segments [Member] | Commercial | consulting [Member]        
Revenues:        
Revenues 334.9 285.0 950.7 843.5
Operating Segments [Member] | Federal Government        
Revenues:        
Revenues 300.1 312.2 908.7 938.7
Costs of services 239.1 247.6 730.1 747.9
Gross Profit:        
Total Gross Profit 61.0 64.6 178.6 190.8
Other Depreciation and Amortization 1.4 1.2 4.4 3.7
Other Expenses 27.9 31.4 86.2 92.6
Selling, general, and administrative expenses 29.3 32.6 90.6 96.3
Amortization of intangible assets 6.3 7.4 19.2 22.2
Operating income 25.4 24.6 68.8 72.3
Operating Segments [Member] | Federal Government | Assignment        
Revenues:        
Revenues 0.0 0.0 0.0 0.0
Operating Segments [Member] | Federal Government | consulting [Member]        
Revenues:        
Revenues 300.1 312.2 908.7 938.7
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Gross Profit:        
Corporate SG&A Expenses $ 25.4 $ 19.0 $ 82.1 $ 58.9