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Share Plans (Tables)
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Compensation Cost
Total share-based compensation expense for 2025, 2024 and 2023 was as follows:
December 31
In millions202520242023
Stock options$4.7 $5.3 $4.3 
Restricted stock units14.7 16.1 15.0 
Performance share units17.6 18.3 9.8 
Total share-based compensation expense$37.0 $39.7 $29.1 
Stock Option Activity
The following table summarizes stock option activity under all plans for the year ended December 31, 2025:
Shares and intrinsic value in millionsNumber of sharesWeighted-
average
exercise
price		Weighted-
average
remaining
contractual life
(years)		Aggregate
intrinsic
value
Outstanding as of January 1, 20251.7 $50.35 
Granted0.1 100.37 
Exercised(0.5)43.73 
Outstanding as of December 31, 20251.3 $57.48 5.6$60.0 
Options exercisable as of December 31, 20250.9 $51.43 4.7$49.3 
Options expected to vest as of December 31, 20250.4 $73.37 7.8$10.7 
Stock Option Fair Value Assumptions
We estimated the fair value of each stock option award issued in the annual share-based compensation grant using a Black-Scholes option pricing model, modified for dividends and using the following assumptions:
 December 31
 202520242023
Risk-free interest rate4.12 %4.44 %4.00 %
Expected dividend yield0.98 %1.43 %2.02 %
Expected share price volatility31.10 %30.90 %30.40 %
Expected term (years)6.96.56.1
Restricted Stock Activity
The following table summarizes restricted stock unit activity under all plans for the year ended December 31, 2025:
Shares in millionsNumber of
shares		Weighted
average
grant date
fair value
Outstanding as of January 1, 20250.5 $62.93 
Granted0.2 94.37 
Vested(0.3)62.94 
Outstanding as of December 31, 20250.4 $77.11 
Performance Shares Award Outstanding Activity
The following table summarizes performance share unit activity under all plans for the year ended December 31, 2025:
Shares in millionsNumber of
shares		Weighted
average
grant date
fair value
Outstanding as of January 1, 20250.4 $59.68 
Granted0.1 99.19 
Vested(0.1)67.14 
Outstanding as of December 31, 20250.4 $68.26