| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 1,518.7a | 536.8a |
| Accounts receivable, net | 1,944.1a | 1,913.3a |
| Unbilled services | 152.9a | 185.4a |
| Supplies inventory | 493.2a | 474.6a |
| Prepaid expenses and other | 697.6a | 655.3a |
| Total current assets | 4,806.5a | 3,765.4a |
| Property, plant and equipment, net | 3,045.4a | 2,911.8a |
| Goodwill, net | 6,369.7a | 6,142.5a |
| Intangible assets, net | 3,488.9a | 3,342a |
| Joint venture partnerships and equity method investments | 16.3a | 26.9a |
| Other assets, net | 652.2a | 536.5a |
| Total assets | 18,379a | 16,725.1a |
| Liabilities and shareholders' equity | — | — |
| Current liabilities | — | — |
| Accounts payable | 875.8a | 827.5a |
| Accrued expenses and other | 871.2a | 804a |
| Unearned revenue | 392.2a | 421.7a |
| Short-term operating lease liabilities | 184.6a | 165.8a |
| Short-term finance lease liabilities | 6.1a | 6.4a |
| Short-term borrowings and current portion of long-term debt | 1,000.3a | 999.8a |
| Total current liabilities | 3,330.2a | 3,225.2a |
| Long-term debt, less current portion | 5,331.2a | 4,054.7a |
| Operating lease liabilities | 676.3a | 648.9a |
| Financing lease liabilities | 74.3a | 78.6a |
| Deferred income taxes and other tax liabilities | 383.1a | 417.9a |
| Other liabilities | 517.4a | 409.3a |
| Total liabilities | 10,312.5a | 8,834.6a |
| Noncontrolling interest | 14.3a | 15.5a |
| Shareholders' equity | — | — |
| Common stock, 83.4 and 83.9 shares outstanding at December 31, 2024, and 2023, respectively | 7.6a | 7.7a |
| Additional paid-in capital | 2.8a | 38.4a |
| Retained earnings | 8,303.4a | 7,888.2a |
| Accumulated other comprehensive loss | -261.6a | -59.3a |
| Total shareholders' equity | 8,052.2a | 7,875a |
| Total liabilities and shareholders' equity | 18,379a | 16,725.1a |