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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Summary of Workers' Compensation Known Claims and IBNR Reserves
Workers’ compensation known claims and IBNR reserves included on the Consolidated Balance Sheets were as follows (in millions):
As of December 31,
20232022
Included in other current liabilities$9.5 $10.0 
Included in other long-term liabilities17.0 13.7 
$26.5 $23.7 
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):
As of December 31,
20232022
Included in other non-current assets$3.0 $2.3 
Contributions to Multiemployer Pensions and Health and Welfare Benefit Plans
Our contributions to multiemployer pension and health and welfare benefit plans were as follows (in millions):
Years ended December 31,
202320222021
Pension plans$3.6 $2.9 $2.8 
Health & welfare plans3.7 3.1 2.9 
Total contributions$7.3 $6.0 $5.7 
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, 2022157,117 $77.31 126,053 $103.37 15,711 $80.55 
Granted81,180 115.87 73,400 109.13 14,730 111.84 
Vested(119,431)78.00 (50,994)95.78 (15,518)80.76 
Forfeited/Cancelled(2,384)99.39 — — (541)97.89 
Nonvested awards/units at December 31, 2023116,482 $103.02 148,459 $108.83 14,382 $111.71 
Summary of Stock Compensation Expenses
The following table summarizes the share-based compensation expense recognized by award type (in millions):

Years ended December 31,
202320222021
Common Stock Awards$7.1 $6.2 $5.3 
Non-Employee Common Stock Awards0.7 0.5 0.5 
Performance-Based Stock Awards6.3 5.4 4.5 
Liability Performance-Based Stock Awards0.3 0.5 2.6 
Performance-Based Restricted Stock Units1.5 1.2 0.9 
$15.9 $13.8 $13.8 
We recorded the following stock compensation expense, by income statement category (in millions):
Years ended December 31,
202320222021
Cost of sales$0.9 $0.6 $0.5 
Selling0.4 0.5 0.2 
Administrative14.6 12.7 13.1 
$15.9 $13.8 $13.8 
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 December 31, 2023
Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$7.4 1.8 years
Performance-Based Stock Awards6.8 1.6 years
Performance-Based Restricted Stock Units0.5 0.3 years
Total unrecognized compensation expense related to unvested awards$14.7