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Employee Benefits (Tables)
 3 Months Ended
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, 2024December 31, 2023
Included in other current liabilities$8.6 $9.5 
Included in other long-term liabilities21.0 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, 2024December 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 AwardsPerformance-Based Stock AwardsPerformance-Based Restricted Stock Units
 AwardsWeighted Average Grant Date Fair Value Per ShareAwardsWeighted Average Grant Date Fair Value Per ShareUnitsWeighted 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 
Granted4,105 205.96 35,320 205.96 — — 
Vested(3,758)101.35 — — — — 
Forfeited/Cancelled(245)102.77 — — (111)111.61 
Nonvested awards/units at March 31, 2024116,584 $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,
 20242023
Common Stock Awards$1.2 $1.4 
Non-Employee Common Stock Awards0.2 0.1 
Performance-Based Stock Awards1.9 1.6 
Liability Performance-Based Stock Awards0.4 — 
Performance-Based Restricted Stock Units0.4 0.3 
$4.1 $3.4 
We recorded the following stock compensation expense by income statement category (in millions):
 Three months ended March 31,
 20242023
Cost of sales$0.3 $0.2 
Selling0.1 0.1 
Administrative3.7 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 Awards12.3 2.1 years
Performance-Based Restricted Stock Units0.1 0.1 years
Total unrecognized compensation expense related to unvested awards$19.1