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v3.25.0.1

Segment Operations (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) numberOfPeople | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Number of Reportable Segments | numberOfPeople | 3 |  |
Total (expenses) and other income | $ (154.1) | $ (74.6) | $ (112.3)
Total revenue | 10,691.7 | 10,889.3 | 10,927.8
Net revenue | 9,187.6 | 9,400.6 | 9,449.4
Operating Income (Loss) | 1,203.2 | 1,482.6 | 1,381.2
Amortization of Intangible Assets | 81.8 | 84.0 | 84.7
Goodwill, Impairment Loss | 232.1 | 0.0 | 0.0
Interest expense | (229.9) | (225.6) | (167.9)
Interest income | 151.7 | 140.8 | 56.6
Other (expense) income, net | (75.9) | 10.2 | (1.0)
Income before income taxes | 1,049.1 | 1,408.0 | 1,268.9
Billable expenses | 1,504.1 | 1,488.7 | 1,478.4
Capital expenditures | 141.8 | 179.3 | 178.1
Assets | 18,325.8 | 19,267.3 |
Restructuring Charges | (5.0) | 0.1 | 102.4
Segment EBITA | $ 1,649.9 | 1,638.9 | 1,560.4
Segment Reporting Information [Line Items] |  |  |
Number of Reportable Segments | numberOfPeople | 3 |  |
Total (expenses) and other income | $ (154.1) | (74.6) | (112.3)
Total revenue | 10,691.7 | 10,889.3 | 10,927.8
Net revenue | 9,187.6 | 9,400.6 | 9,449.4
Operating Income (Loss) | 1,203.2 | 1,482.6 | 1,381.2
Amortization of Intangible Assets | 81.8 | 84.0 | 84.7
Goodwill, Impairment Loss | 232.1 | 0.0 | 0.0
Interest expense | (229.9) | (225.6) | (167.9)
Interest income | 151.7 | 140.8 | 56.6
Other (expense) income, net | (75.9) | 10.2 | (1.0)
Income before income taxes | 1,049.1 | 1,408.0 | 1,268.9
Billable expenses | 1,504.1 | 1,488.7 | 1,478.4
Capital expenditures | 141.8 | 179.3 | 178.1
Assets | 18,325.8 | 19,267.3 |
Restructuring Charges | (5.0) | 0.1 | 102.4
Segment EBITA | 1,649.9 | 1,638.9 | 1,560.4
MD&E |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
EBITA | 847.9 | 836.9 | 748.4
Salary and Wage, Excluding Cost of Good and Service Sold | 2,207.9 | 2,358.4 | 2,286.2
Incentive Fee Expense | 128.4 | 124.4 | 158.0
Other Labor-related Expenses | 85.3 | 104.4 | 135.4
Other segment expenses | 81.1 | 92.4 | 182.8
Amortization | 77.2 | 77.3 | 72.8
Total revenue | 4,274.3 | 4,417.4 | 4,401.1
Net revenue | 4,213.8 | 4,348.6 | 4,315.7
Goodwill, Impairment Loss | 232.1 |  |
Capital expenditures | 75.6 | 100.2 | 97.5
Assets | 10,248.1 | 10,737.5 |
Segment Reporting Information [Line Items] |  |  |
EBITA | 847.9 | 836.9 | 748.4
Salary and Wage, Excluding Cost of Good and Service Sold | 2,207.9 | 2,358.4 | 2,286.2
Incentive Fee Expense | 128.4 | 124.4 | 158.0
Other Labor-related Expenses | 85.3 | 104.4 | 135.4
Other segment expenses | 81.1 | 92.4 | 182.8
Amortization | 77.2 | 77.3 | 72.8
Total revenue | 4,274.3 | 4,417.4 | 4,401.1
Net revenue | 4,213.8 | 4,348.6 | 4,315.7
Goodwill, Impairment Loss | 232.1 |  |
Capital expenditures | 75.6 | 100.2 | 97.5
Assets | 10,248.1 | 10,737.5 |
IA&C |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
EBITA | 542.6 | 536.8 | 577.5
Salary and Wage, Excluding Cost of Good and Service Sold | 2,187.0 | 2,244.3 | 2,225.9
Incentive Fee Expense | 95.6 | 84.9 | 139.8
Other Labor-related Expenses | 142.9 | 154.0 | 203.6
Other segment expenses | 409.2 | 414.9 | 451.5
Amortization | 3.1 | 4.3 | 7.2
Total revenue | 3,907.2 | 3,979.6 | 4,121.1
Net revenue | 3,544.4 | 3,611.1 | 3,747.5
Goodwill, Impairment Loss | 0.0 |  |
Capital expenditures | 29.5 | 40.7 | 43.7
Assets | 4,549.9 | 4,790.4 |
Segment Reporting Information [Line Items] |  |  |
EBITA | 542.6 | 536.8 | 577.5
Salary and Wage, Excluding Cost of Good and Service Sold | 2,187.0 | 2,244.3 | 2,225.9
Incentive Fee Expense | 95.6 | 84.9 | 139.8
Other Labor-related Expenses | 142.9 | 154.0 | 203.6
Other segment expenses | 409.2 | 414.9 | 451.5
Amortization | 3.1 | 4.3 | 7.2
Total revenue | 3,907.2 | 3,979.6 | 4,121.1
Net revenue | 3,544.4 | 3,611.1 | 3,747.5
Goodwill, Impairment Loss | 0.0 |  |
Capital expenditures | 29.5 | 40.7 | 43.7
Assets | 4,549.9 | 4,790.4 |
SC&E |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
EBITA | 259.4 | 265.2 | 234.5
Salary and Wage, Excluding Cost of Good and Service Sold | 870.9 | 860.7 | 836.4
Incentive Fee Expense | 33.1 | 43.3 | 44.2
Other Labor-related Expenses | 45.7 | 52.4 | 51.8
Other segment expenses | 1,102.1 | 1,074.6 | 1,044.3
Amortization | 1.5 | 2.4 | 4.7
Total revenue | 2,510.2 | 2,492.3 | 2,405.6
Net revenue | 1,429.4 | 1,440.9 | 1,386.2
Goodwill, Impairment Loss | 0.0 |  |
Capital expenditures | 12.1 | 6.4 | 7.3
Assets | 1,758.9 | 1,800.6 |
Segment Reporting Information [Line Items] |  |  |
EBITA | 259.4 | 265.2 | 234.5
Salary and Wage, Excluding Cost of Good and Service Sold | 870.9 | 860.7 | 836.4
Incentive Fee Expense | 33.1 | 43.3 | 44.2
Other Labor-related Expenses | 45.7 | 52.4 | 51.8
Other segment expenses | 1,102.1 | 1,074.6 | 1,044.3
Amortization | 1.5 | 2.4 | 4.7
Total revenue | 2,510.2 | 2,492.3 | 2,405.6
Net revenue | 1,429.4 | 1,440.9 | 1,386.2
Goodwill, Impairment Loss | 0.0 |  |
Capital expenditures | 12.1 | 6.4 | 7.3
Assets | 1,758.9 | 1,800.6 |
Corporate Segment and Other Operating Segment |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
EBITA | (132.8) | (72.3) | (94.5)
Assets | 1,768.9 | 1,938.8 |
Segment Reporting Information [Line Items] |  |  |
EBITA | (132.8) | (72.3) | $ (94.5)
Assets | $ 1,768.9 | $ 1,938.8 |

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