| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 702.6a | 524.1a |
| Trade accounts receivable, net of allowance for expected credit losses of $55.0 and $55.9 in 2024 and 2023, respectively | 3,454.4a | 3,639.5a |
| Other accounts receivable | 416.3a | 430.5a |
| Inventories | 3,501.7a | 3,572.1a |
| Prepaid expenses and other current assets | 276.4a | 225.4a |
| Total current assets | 8,351.4a | 8,391.6a |
| Property, buildings and equipment, net | 442.9a | 423.6a |
| Operating lease assets | 735.1a | 761.2a |
| Intangible assets, net | 1,835.9a | 1,857.6a |
| Goodwill | 3,280.1a | 3,262.3a |
| Deferred income taxes | 41.9a | 42.3a |
| Other assets | 374.1a | 322.3a |
| Total assets | 15,061.4a | 15,060.9a |
| Liabilities and stockholders’ equity | — | — |
| Current liabilities | — | — |
| Accounts payable | 2,670.6a | 2,431.5a |
| Accrued payroll and benefit costs | 242.3a | 191.7a |
| Short-term debt and current portion of long-term debt | 19.5a | 8.6a |
| Other current liabilities | 871.6a | 756.6a |
| Total current liabilities | 3,804a | 3,388.4a |
| Long-term debt, net of debt discount and debt issuance costs of $47.2 and $43.0 in 2024 and 2023, respectively | 5,045.5a | 5,313.1a |
| Operating lease liabilities | 614.8a | 641.7a |
| Deferred income taxes | 415.6a | 451.9a |
| Other noncurrent liabilities | 216a | 233.9a |
| Total liabilities | 10,095.9a | 10,029a |
| Stockholders’ equity | — | — |
| Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding | | |
| Preferred stock, Series A, $.01 par value; 25,000 shares authorized, 21,612 shares issued and outstanding in 2024 and 2023, respectively | | |
| Common stock, $.01 par value; 210,000,000 shares authorized, 69,627,398 and 69,278,677 shares issued and 48,790,595 and 50,897,122 shares outstanding in 2024 and 2023, respectively | 0.7a | 0.7a |
| Class B nonvoting convertible common stock, $.01 par value; 20,000,000 shares authorized, 4,339,431 issued and no shares outstanding in 2024 and 2023, respectively | | |
| Additional capital | 2,051.6a | 2,037.1a |
| Retained earnings | 4,960.7a | 4,391.7a |
| Treasury stock, at cost; 25,176,234 and 22,720,986 shares in 2024 and 2023, respectively | -1,495.1a | -1,060.4a |
| Accumulated other comprehensive loss | -547.2a | -332a |
| Total WESCO International, Inc. stockholders’ equity | 4,970.7a | 5,037.1a |
| Noncontrolling interests | -5.2a | -5.2a |
| Total stockholders’ equity | 4,965.5a | 5,031.9a |
| Total liabilities and stockholders’ equity | 15,061.4a | 15,060.9a |