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Employee Benefits (Tables)
 6 Months Ended
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, 2024December 31, 2023
Included in other current liabilities$9.5 $9.5 
Included in other long-term liabilities16.9 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, 2024December 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 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 
Granted37,884 235.11 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, 202499,134 $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,
 2024202320242023
Common Stock Awards$1.8 $1.5 $3.0 $2.9 
Non-Employee Common Stock Awards0.2 0.1 0.4 0.3 
Performance-Based Stock Awards1.8 1.6 3.6 3.1 
Liability Performance-Based Stock Awards0.4 0.1 0.8 0.1 
Performance-Based Restricted Stock Units0.5 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,
 2024202320242023
Cost of sales$0.3 $0.2 $0.6 $0.4 
Selling0.2 0.1 0.2 0.2 
Administrative4.2 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 Awards10.5 1.9 years
Performance-Based Restricted Stock Units1.4 0.8 years
Total unrecognized compensation expense related to unvested awards$24.4