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v3.24.3

Supplementary Data (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Text Block [Abstract] |  |  |  |  |  |
Goodwill | $ 5,080,900,000 | $ 4,738,700,000 |  | $ 4,738,700,000 |  | $ 5,080,900,000
Goodwill, Acquired During Period |  |  |  | (117,600,000) |  |
Goodwill, Other Decrease |  |  |  | 7,500,000 |  |
Goodwill | 5,080,900,000 | 4,738,700,000 |  | 4,738,700,000 |  | 5,080,900,000
Goodwill, Transfers | 0 |  |  |  |  |
Goodwill, Acquired During Period |  |  |  | (117,600,000) |  |
Goodwill, Impairment Loss |  | (232,100,000) | $ 0 | (232,100,000) | $ 0 |
Goodwill, Other Decrease |  |  |  | 7,500,000 |  |
Restructuring charges |  | 500,000 | (600,000) | 1,400,000 | (700,000) |
Operating lease right-of-use asset |  | 1,062,100,000 |  | 1,062,100,000 |  | 1,162,600,000
Disposal Group, Including Discontinued Operation, Assets, Net of Valuation Allowance |  | 223,400,000 |  | 223,400,000 |  |
Disposal Group, Including Discontinued Operation, Accounts Payable |  | 18,500,000 |  | 18,500,000 |  |
Disposal Group, Including Discontinued Operation, Accrued Liabilities |  | 6,100,000 |  | 6,100,000 |  |
Disposal Group, Including Discontinued Operation, Current porting of oprerating leases |  | 3,100,000 |  | 3,100,000 |  |
Disposal Group, Including Discontinued Operation, Non-current operating leases |  | 31,700,000 |  | 31,700,000 |  |
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent |  | 700,000 |  | 700,000 |  |
Disposal Group, Including Discontinued Operation, Liabilities |  | 60,100,000 |  | 60,100,000 |  |
Disposal Group, Including Discontinued Operation, Net Assets |  | 163,300,000 |  | 163,300,000 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  | 207,200,000 |  | 207,200,000 |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Sales and Disposals |  |  |  | (15,400,000) |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents |  | 7,400,000 |  | 7,400,000 |  |
Accounts Receivable, Held-for-Sale |  | 36,200,000 |  | 36,200,000 |  |
Accounts receivable, billable to clients, Held-for-Sale |  | 27,100,000 |  | 27,100,000 |  |
Disposal Group, Including Discontinued Operation, Goodwill |  | 116,600,000 |  | 116,600,000 |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  | 15,400,000 |  | 15,400,000 |  |
Disposal Group, Including Discontinued Operation, Operating lease right-of-use assets |  | 30,500,000 |  | 30,500,000 |  |
Disposal Group, Including Discontinued Operation, Other Assets |  | 5,600,000 |  | 5,600,000 |  |
Disposal Group, Including Discontinued Operation, Assets |  | 238,800,000 |  | $ 238,800,000 |  |
Minimum [Member] |  |  |  |  |  |
Goodwill testing discount rate |  |  |  | 14.50% |  |
Measurement Input, Revenue Growth Rate 1-5yrs |  |  |  | (2.00%) |  |
Measurement Input, Terminal Revenue Growth Rate |  |  |  | 2.50% |  |
Maximum [Member] |  |  |  |  |  |
Goodwill testing discount rate |  |  |  | 22.00% |  |
Measurement Input, Revenue Growth Rate 1-5yrs |  |  |  | 6.00% |  |
Measurement Input, Terminal Revenue Growth Rate |  |  |  | 3.00% |  |
MD&E |  |  |  |  |  |
Text Block [Abstract] |  |  |  |  |  |
Goodwill | 2,690,800,000 | 2,347,200,000 |  | $ 2,347,200,000 |  | 2,677,500,000
Goodwill, Acquired During Period |  |  |  | (116,500,000) |  |
Goodwill, Other Decrease |  |  |  | 5,000,000.0 |  |
Goodwill | 2,690,800,000 | 2,347,200,000 |  | 2,347,200,000 |  | 2,677,500,000
Goodwill, Transfers | 13,300,000 |  |  |  |  |
Goodwill, Acquired During Period |  |  |  | (116,500,000) |  |
Goodwill, Impairment Loss |  | (232,100,000) | 0 | (232,100,000) | 0 |
Goodwill, Other Decrease |  |  |  | 5,000,000.0 |  |
Lease impairment costs |  | 400,000 | (100,000) | 600,000 | (1,300,000) |
Restructuring charges |  | 500,000 | (100,000) | 800,000 | (1,300,000) |
Disposal Group, Including Discontinued Operation, Goodwill |  | 24,900,000 |  | 24,900,000 |  |
IA&C |  |  |  |  |  |
Text Block [Abstract] |  |  |  |  |  |
Goodwill | 1,709,900,000 | 1,709,500,000 |  | 1,709,500,000 |  | 1,723,200,000
Goodwill, Acquired During Period |  |  |  | (1,200,000) |  |
Goodwill, Other Decrease |  |  |  | 800,000 |  |
Goodwill | 1,709,900,000 | 1,709,500,000 |  | 1,709,500,000 |  | 1,723,200,000
Goodwill, Transfers | (13,300,000) |  |  |  |  |
Goodwill, Acquired During Period |  |  |  | (1,200,000) |  |
Goodwill, Impairment Loss |  |  |  | 0 |  |
Goodwill, Other Decrease |  |  |  | 800,000 |  |
Lease impairment costs |  |  | (600,000) | 300,000 | (800,000) |
Restructuring charges |  | 0 | (500,000) | 300,000 | (200,000) |
SC&E |  |  |  |  |  |
Text Block [Abstract] |  |  |  |  |  |
Goodwill | 680,200,000 | 682,000,000.0 |  | 682,000,000.0 |  | 680,200,000
Goodwill, Acquired During Period |  |  |  | 100,000 |  |
Goodwill, Other Decrease |  |  |  | 1,700,000 |  |
Goodwill | 680,200,000 | 682,000,000.0 |  | 682,000,000.0 |  | $ 680,200,000
Goodwill, Transfers | $ 0 |  |  |  |  |
Goodwill, Acquired During Period |  |  |  | 100,000 |  |
Goodwill, Impairment Loss |  |  |  | 0 |  |
Goodwill, Other Decrease |  |  |  | 1,700,000 |  |
Lease impairment costs |  |  | (200,000) | 300,000 |  |
Restructuring charges |  | $ 0 | $ (200,000) | $ 300,000 | $ 700,000 |

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