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Segment Reporting - Segment Reporting Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues:    
Revenues $ 968,300,000 $ 1,049,000,000
Costs of services 692,900,000 752,800,000
Gross Profit:    
Total Gross Profit 275,400,000 296,200,000
Selling, general, and administrative expenses 214,500,000 210,200,000
Amortization of intangible assets 14,300,000 15,100,000
Operating income 46,600,000 70,900,000
Interest Expense, Operating and Nonoperating 15,400,000 17,600,000
Income before income taxes 31,200,000 53,300,000
Federal Government    
Revenues:    
Revenues 296,100,000 317,500,000
Operating Segments [Member]    
Revenues:    
Revenues 968,300,000 1,049,000,000
Costs of services 692,900,000 752,800,000
Gross Profit:    
Total Gross Profit 275,400,000 296,200,000
Other Depreciation and Amortization 10,500,000 8,500,000
Other Expenses 175,700,000 180,800,000
Selling, general, and administrative expenses 186,200,000 189,300,000
Amortization of intangible assets 14,300,000 15,100,000
Operating income 74,900,000 91,800,000
Operating Segments [Member] | Assignment    
Revenues:    
Revenues 382,100,000 454,500,000
Operating Segments [Member] | consulting [Member]    
Revenues:    
Revenues 586,200,000 594,500,000
Operating Segments [Member] | Commercial    
Revenues:    
Revenues 672,200,000 731,500,000
Costs of services 454,500,000 497,700,000
Gross Profit:    
Total Gross Profit 217,700,000 233,800,000
Other Depreciation and Amortization 9,000,000.0 7,200,000
Other Expenses 146,000,000.0 150,100,000
Selling, general, and administrative expenses 155,000,000.0 157,300,000
Amortization of intangible assets 7,800,000 7,700,000
Operating income 54,900,000 68,800,000
Operating Segments [Member] | Commercial | Assignment    
Revenues:    
Revenues 382,100,000 454,500,000
Operating Segments [Member] | Commercial | consulting [Member]    
Revenues:    
Revenues 290,100,000 277,000,000.0
Operating Segments [Member] | Federal Government    
Revenues:    
Revenues 296,100,000 317,500,000
Costs of services 238,400,000 255,100,000
Gross Profit:    
Total Gross Profit 57,700,000 62,400,000
Other Depreciation and Amortization 1,500,000 1,300,000
Other Expenses 29,700,000 30,700,000
Selling, general, and administrative expenses 31,200,000 32,000,000.0
Amortization of intangible assets 6,500,000 7,400,000
Operating income 20,000,000.0 23,000,000.0
Operating Segments [Member] | Federal Government | Assignment    
Revenues:    
Revenues 0 0
Operating Segments [Member] | Federal Government | consulting [Member]    
Revenues:    
Revenues 296,100,000 317,500,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]    
Gross Profit:    
Corporate SG&A Expenses $ 28,300,000 $ 20,900,000