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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 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):
| June 30, 2024 |  | December 31, 2023
Included in other current liabilities | $ | 9.5 |  |  | $ | 9.5 |
Included in other long-term liabilities | 16.9 |  |  | 17.0 |
| $ | 26.4 |  |  | $ | 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):
| June 30, 2024 |  | December 31, 2023
Included in other non-current assets | $ | 3.8 |  |  | $ | 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 | 37,884 |  |  | 235.11 |  |  | 35,320 |  |  | 205.96 |  |  | 8,130 |  |  | 242.85 |
Vested | (54,834) |  |  | 103.81 |  |  | (51,215) |  |  | 111.12 |  |  | (14,271) |  |  | 111.71 |
Forfeited/Cancelled | (398) |  |  | 156.62 |  |  | — |  |  | — |  |  | (253) |  |  | 185.27 |
Nonvested awards/units at June 30, 2024 | 99,134 |  |  | $ | 152.85 |  |  | 132,564 |  |  | $ | 133.82 |  |  | 7,988 |  |  | $ | 242.85 |
Summary of Stock Compensation Expenses | The following table summarizes the share-based compensation expense recognized by award type (in millions):
| Three months ended June 30, |  | Six months ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Common Stock Awards | $ | 1.8 |  |  | $ | 1.5 |  |  | $ | 3.0 |  |  | $ | 2.9 |
Non-Employee Common Stock Awards | 0.2 |  |  | 0.1 |  |  | 0.4 |  |  | 0.3 |
Performance-Based Stock Awards | 1.8 |  |  | 1.6 |  |  | 3.6 |  |  | 3.1 |
Liability Performance-Based Stock Awards | 0.4 |  |  | 0.1 |  |  | 0.8 |  |  | 0.1 |
Performance-Based Restricted Stock Units | 0.5 |  |  | 0.4 |  |  | 0.9 |  |  | 0.7 |
| $ | 4.7 |  |  | $ | 3.7 |  |  | $ | 8.7 |  |  | $ | 7.1 |
We recorded the following stock compensation expense by income statement category (in millions):
| Three months ended June 30, |  | Six months ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Cost of sales | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.6 |  |  | $ | 0.4 |
Selling | 0.2 |  |  | 0.1 |  |  | 0.2 |  |  | 0.2 |
Administrative | 4.2 |  |  | 3.4 |  |  | 7.9 |  |  | 6.5 |
| $ | 4.7 |  |  | $ | 3.7 |  |  | $ | 8.7 |  |  | $ | 7.1 |
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 June 30, 2024
| Unrecognized Compensation Expense on Unvested Awards |  | Weighted Average Remaining Vesting Period
Common Stock Awards | $ | 12.5 |  |  | 2.1 years
Performance-Based Stock Awards | 10.5 |  |  | 1.9 years
Performance-Based Restricted Stock Units | 1.4 |  |  | 0.8 years
Total unrecognized compensation expense related to unvested awards | $ | 24.4 |  |  |

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