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Segment Reporting - Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenues:        
Revenues $ 1,020.6 $ 1,034.7 $ 1,988.9 $ 2,083.7
Costs of services 727.3 733.6 1,420.2 1,486.4
Gross Profit:        
Total Gross Profit 293.3 301.1 568.7 597.3
Selling, general, and administrative expenses 216.8 205.6 431.3 415.8
Amortization of intangible assets 16.9 15.1 31.2 30.2
Operating income 59.6 80.4 106.2 151.3
Interest Expense, Operating and Nonoperating 18.2 15.8 33.6 33.4
Income before income taxes 41.4 64.6 72.6 117.9
Provision for income taxes 12.1 17.4 22.4 32.6
Net income 29.3 47.2 50.2 85.3
Federal Government        
Revenues:        
Revenues 312.5 309.0 608.6 626.5
Operating Segments [Member]        
Revenues:        
Revenues 1,020.6 1,034.7 1,988.9 2,083.7
Costs of services 727.3 733.6 1,420.2 1,486.4
Gross Profit:        
Total Gross Profit 293.3 301.1 568.7 597.3
Other Depreciation and Amortization 10.5 8.5 21.0 17.0
Other Expenses 177.9 178.1 353.6 358.9
Selling, general, and administrative expenses 188.4 186.6 374.6 375.9
Amortization of intangible assets 16.9 15.1 31.2 30.2
Operating income 88.0 99.4 162.9 191.2
Operating Segments [Member] | Assignment        
Revenues:        
Revenues 382.4 444.2 764.5 898.7
Operating Segments [Member] | consulting [Member]        
Revenues:        
Revenues 638.2 590.5 1,224.4 1,185.0
Operating Segments [Member] | Commercial        
Revenues:        
Revenues 708.1 725.7 1,380.3 1,457.2
Costs of services 474.7 488.4 929.2 986.1
Gross Profit:        
Total Gross Profit 233.4 237.3 451.1 471.1
Other Depreciation and Amortization 9.0 7.3 18.0 14.5
Other Expenses 149.3 147.6 295.3 297.7
Selling, general, and administrative expenses 158.3 154.9 313.3 312.2
Amortization of intangible assets 10.5 7.7 18.3 15.4
Operating income 64.6 74.7 119.5 143.5
Operating Segments [Member] | Commercial | Assignment        
Revenues:        
Revenues 382.4 444.2 764.5 898.7
Operating Segments [Member] | Commercial | consulting [Member]        
Revenues:        
Revenues 325.7 281.5 615.8 558.5
Operating Segments [Member] | Federal Government        
Revenues:        
Revenues 312.5 309.0 608.6 626.5
Costs of services 252.6 245.2 491.0 500.3
Gross Profit:        
Total Gross Profit 59.9 63.8 117.6 126.2
Other Depreciation and Amortization 1.5 1.2 3.0 2.5
Other Expenses 28.6 30.5 58.3 61.2
Selling, general, and administrative expenses 30.1 31.7 61.3 63.7
Amortization of intangible assets 6.4 7.4 12.9 14.8
Operating income 23.4 24.7 43.4 47.7
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 312.5 309.0 608.6 626.5
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Gross Profit:        
Corporate SG&A Expenses $ 28.4 $ 19.0 $ 56.7 $ 39.9