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Employee Benefits (Tables)
 9 Months Ended
Sep. 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):
September 30, 2024December 31, 2023
Included in other current liabilities$8.5 $9.5 
Included in other long-term liabilities17.7 17.0 
$26.2 $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):
 September 30, 2024December 31, 2023
Included in other non-current assets$3.6 $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 
Granted45,166 230.55 35,320 205.96 8,228 242.85 
Vested(54,834)103.81 (51,215)111.12 (14,271)111.71 
Forfeited/Cancelled(398)156.62 — — (334)199.23 
Nonvested awards/units at September 30, 2024106,416 $156.54 132,564 $133.82 8,005 $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 September 30,Nine months ended September 30,
 2024202320242023
Common Stock Awards$1.8 $1.3 $4.8 $4.2 
Non-Employee Common Stock Awards0.2 0.2 0.6 0.5 
Performance-Based Stock Awards1.7 1.5 5.3 4.6 
Liability Performance-Based Stock Awards0.3 0.1 1.1 0.2 
Performance-Based Restricted Stock Units0.5 0.4 1.4 1.1 
$4.5 $3.5 $13.2 $10.6 
We recorded the following stock compensation expense by income statement category (in millions):
 Three months ended September 30,Nine months ended September 30,
 2024202320242023
Cost of sales$0.2 $0.2 $0.8 $0.6 
Selling0.2 0.1 0.4 0.3 
Administrative4.1 3.2 12.0 9.7 
$4.5 $3.5 $13.2 $10.6 
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 September 30, 2024
 Unrecognized
Compensation Expense
on Unvested Awards		Weighted Average
Remaining
Vesting Period
Common Stock Awards$12.1 1.8 years
Performance-Based Stock Awards8.8 1.7 years
Performance-Based Restricted Stock Units1.0 0.5 years
Total unrecognized compensation expense related to unvested awards$21.9