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Share-based Payments (Tables)
 12 Months Ended
Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation costs related to share-based payments
The following table presents the components of share-based payment expense by consolidated income statement classification:
Year ended December 31,202520242023
Selling, general and administrative:
Stock option compensation expense$0.8 $3.5 $7.7 
Equity-classified share units55.0 47.1 32.0 
Liability-classified share units1.4 2.9 2.5 
Employee stock purchase plan7.3 7.3 4.7 
64.5 60.8 46.9 
Acquisition-related and integration costs:
Acceleration of share-based payments expense— 1.0 6.8 
Share-based continuing employment costs1.5 0.6 3.8 
1.5 1.6 10.6 
$66.0 $62.4 $57.5 
Summary of stock option activity The following table presents stock options granted historically, which remain outstanding and exercisable as of December 31, 2025 (actual number of stock options):
Stock optionsPremium-priced stock options
Outstanding, December 31, 2025790,276392,238
Exercisable, December 31, 2025716,433392,238
ESPP valuation assumptions
The significant assumptions used to estimate the fair value of ESPP awards are presented in the following table on a weighted-average basis:
December 31, 2025December 31, 2024December 31, 2023
Risk free interest rate3.8 %4.4 %5.3 %
Expected dividend yield1.24 %1.26 %1.81 %
Expected lives of the ESPP9 months9 months8 months
Expected volatility22.7 %27.5 %28.1 %
Schedule of shares issuance activity
The following table summarizes share unit activity (actual number of units; weighted-average grant-date fair value per unit):
PSUs (Performance)PSUs (Market)RSUsDSUs
NumberWA grant
date fair
value		NumberWA grant
date fair
value		NumberWA grant
 date fair
value		NumberWA grant
date fair
value
Outstanding, December 31, 2022662,634$51.71 102,879$66.08 68,024$58.32 108,365$39.35 
Granted94,72958.04 80,398— 425,30953.35 24,57355.49 
Assumed in IAA acquisition—— —— 366,37952.79 —— 
Vested and settled(283,086)42.23 —— (309,102)53.22 (32,378)54.68 
Forfeited(58,848)60.62 (9,017)— (10,939)55.06 —— 
Outstanding, December 31, 2023415,429$58.35 174,260$— 539,671$53.64 100,560$38.36 
Granted164,52076.11 162,942122.91 340,27176.64 11,88772.93 
Vested and settled(114,315)58.79 (58,511)66.08 (237,766)53.74 (38,957)45.28 
Forfeited(15,459)58.37 (9,737)84.04 (34,371)62.12 —— 
Outstanding, December 31, 2024450,175$64.73 268,954$105.53 607,805$66.00 73,490$40.29 
Granted154,552 99.76 154,322 151.24 481,294 98.22 830104.28 
Vested and settled(132,252)58.78 (234)129.28 (286,298)63.59 (2,245)67.40 
Forfeited(98,294)61.82 (48,861)86.19 (46,604)84.20 —— 
Outstanding, December 31, 2025374,181$82.06 374,181$126.89 756,197$86.30 72,075$40.18 
PSU  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock options valuation assumptions The significant assumptions used to estimate the fair value are presented in the following table on a weighted-average basis:
December 31, 2025December 31, 2024December 31, 2023
Risk free interest rate4.0 %4.4 %4.5 %
Expected lives of the PSUs3 years3 years2 years
Expected volatility30.4 %32.2 %32.7 %
Average expected volatility of comparable companies34.7 %48.3 %48.6 %