| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 169.9a | 216.8a |
| Trade accounts receivable, net of allowance for doubtful accounts of $16.9 and $16.7 at december 31, 2024 and 2023, respectively | 957.6a | 908.2a |
| Prepaid expenses | 134.9a | 142.5a |
| Other current assets | 98.2a | 88.8a |
| Total current assets | 1,360.6a | 1,356.3a |
| Property and equipment | — | — |
| Capitalized internal-use software and system costs | 2,817.5a | 2,541a |
| Data processing equipment and furniture | 229.6a | 247.9a |
| Land, buildings and improvements | 285a | 272.9a |
| Total property and equipment | 3,332.1a | 3,061.8a |
| Less accumulated depreciation and amortization | -1,440.2a | -1,227.8a |
| Total property and equipment, net | 1,891.9a | 1,834a |
| Goodwill | 6,547.8a | 6,829.9a |
| Indefinite-lived intangible assets | 94.7a | 94.8a |
| Purchased intangible assets, net | 1,521a | 1,858.8a |
| Other assets, net | 343.4a | 306.2a |
| Total assets | 11,759.4a | 12,280a |
| Liabilities and equity | — | — |
| Current liabilities | — | — |
| Short-term debt and current maturities of long-term debt | 687.7a | 963.4a |
| Accounts payable | 138.2a | 197.6a |
| Accrued expenses | 251.1a | 245.1a |
| Accrued salaries and bonuses | 215.8a | 168.7a |
| Deferred revenue | 115.5a | 109.5a |
| Other current liabilities | 403.2a | 334.7a |
| Total current liabilities | 1,811.5a | 2,019a |
| Long-term debt | 4,322.8a | 4,747.8a |
| Deferred income tax liabilities, net | 351.6a | 474.9a |
| Long-term pension and other postretirement benefit liabilities | 106.7a | 100.1a |
| Other long-term liabilities | 247.2a | 250.7a |
| Total liabilities | 6,839.8a | 7,592.5a |
| Redeemable noncontrolling interests | 105.2a | 135.1a |
| Equifax shareholders’ equity | — | — |
| Preferred stock, $0.01 par value: Authorized shares - 10.0; Issued shares - none | 0a | 0a |
| Common stock, $1.25 par value: Authorized shares - 300.0; Issued shares - 189.3 at december 31, 2024 and 2023; Outstanding shares - 124.0 and 123.3 at december 31, 2024 and 2023, respectively | 236.6a | 236.6a |
| Paid-in capital | 1,915.2a | 1,761.3a |
| Retained earnings | 6,018.6a | 5,608.6a |
| Accumulated other comprehensive loss | -722.7a | -431.2a |
| Treasury stock, at cost, 64.7 shares and 65.4 shares at december 31, 2024 and 2023, respectively | -2,644.9a | -2,635.3a |
| Stock held by employee benefits trusts, at cost, 0.6 shares at december 31, 2024 and 2023 | -5.9a | -5.9a |
| Total Equifax shareholders’ equity | 4,796.9a | 4,534.1a |
| Noncontrolling interests | 17.5a | 18.3a |
| Total shareholders’ equity | 4,814.4a | 4,552.4a |
| Total liabilities, redeemable noncontrolling interests, and shareholders' equity | 11,759.4a | 12,280a |