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Employee Benefits (Tables) | 3 Months Ended
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Mar. 31, 2024
Postemployment Benefits [Abstract] |
Summary of Workers' Compensation Known Claims and IBNR Reserves | Workers’ compensation known claims and IBNR reserves included on the Condensed Consolidated Balance Sheets were as follows (in millions):
| March 31, 2024 |  | December 31, 2023
Included in other current liabilities | $ | 8.6 |  |  | $ | 9.5 |
Included in other long-term liabilities | 21.0 |  |  | 17.0 |
| $ | 29.6 |  |  | $ | 26.5 |
Schedule of Insurance Receivable for Claims | This receivable offsets an equal liability included within the reserve amounts noted above and was as follows (in millions):
| March 31, 2024 |  | December 31, 2023
Included in other non-current assets | $ | 4.9 |  |  | $ | 3.0 |
Summary of Equity-based Awards for Employees | Amounts and changes for each category of equity-based award were as follows:
| Common Stock Awards |  | Performance-Based Stock Awards |  | Performance-Based Restricted Stock Units
| Awards |  | Weighted Average Grant Date Fair Value Per Share |  | Awards |  | Weighted Average Grant Date Fair Value Per Share |  | Units |  | Weighted Average Grant Date Fair Value Per Share
Nonvested awards/units at December 31, 2023 | 116,482 |  |  | $ | 103.02 |  |  | 148,459 |  |  | $ | 108.83 |  |  | 14,382 |  |  | $ | 111.71 |
Granted | 4,105 |  |  | 205.96 |  |  | 35,320 |  |  | 205.96 |  |  | — |  |  | — |
Vested | (3,758) |  |  | 101.35 |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited/Cancelled | (245) |  |  | 102.77 |  |  | — |  |  | — |  |  | (111) |  |  | 111.61 |
Nonvested awards/units at March 31, 2024 | 116,584 |  |  | $ | 106.70 |  |  | 183,779 |  |  | $ | 127.49 |  |  | 14,271 |  |  | $ | 111.71 |
Summary of Stock Compensation Expenses | The following table summarizes the share-based compensation expense recognized by award type (in millions):
| Three months ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
Common Stock Awards | $ | 1.2 |  |  | $ | 1.4 |  |  |  |  |
Non-Employee Common Stock Awards | 0.2 |  |  | 0.1 |  |  |  |  |
Performance-Based Stock Awards | 1.9 |  |  | 1.6 |  |  |  |  |
Liability Performance-Based Stock Awards | 0.4 |  |  | — |  |  |  |  |
Performance-Based Restricted Stock Units | 0.4 |  |  | 0.3 |  |  |  |  |
| $ | 4.1 |  |  | $ | 3.4 |  |  |  |  |
We recorded the following stock compensation expense by income statement category (in millions):
| Three months ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
Cost of sales | $ | 0.3 |  |  | $ | 0.2 |  |  |  |  |
Selling | 0.1 |  |  | 0.1 |  |  |  |  |
Administrative | 3.7 |  |  | 3.1 |  |  |  |  |
| $ | 4.1 |  |  | $ | 3.4 |  |  |  |  |
Unrecognized Share-Based Compensation Expense Related to Unvested Awards | Unrecognized share-based compensation expense related to unvested awards was as follows (in millions):
| As of March 31, 2024
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 6.7 |  |  | 1.6 years
Performance-Based Stock Awards | 12.3 |  |  | 2.1 years
Performance-Based Restricted Stock Units | 0.1 |  |  | 0.1 years
Total unrecognized compensation expense related to unvested awards | $ | 19.1 |  |  |

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