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Share Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Cost
Total share-based compensation expense for 2020, 2019 and 2018 was as follows:
December 31
In millions202020192018
Restricted stock units$12.5 $11.2 $8.9 
Stock options3.0 4.5 4.6 
Performance share units4.8 5.7 7.4 
Total share-based compensation expense$20.3 $21.4 $20.9 
Stock Option Activity
The following table summarizes stock option activity under all plans for the year ended December 31, 2020:
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, 20203.8 $37.29 
Granted0.4 44.58 
Exercised(1.1)30.05 
Forfeited(0.3)45.61 
Outstanding as of December 31, 20202.8 $40.47 5.6$35.5 
Options exercisable as of December 31, 20202.1 $39.72 4.7$28.6 
Options expected to vest as of December 31, 20200.7 $42.85 8.4$6.8 
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
 202020192018
Risk-free interest rate1.61 %2.89 %2.58 %
Expected dividend yield1.80 %1.78 %1.56 %
Expected share price volatility24.10 %23.30 %24.80 %
Expected term (years)6.86.16.1
Restricted Stock Activity
The following table summarizes restricted stock unit activity under all plans for the year ended December 31, 2020:
Shares in millionsNumber of
shares		Weighted
average
grant date
fair value
Outstanding as of January 1, 20200.6 $42.16 
Granted0.4 42.37 
Vested(0.2)40.85 
Forfeited(0.1)42.79 
Outstanding as of December 31, 20200.7 $42.52 
Performance Shares Award Outstanding Activity
The following table summarizes performance share unit activity under all plans for the year ended December 31, 2020:
Shares in millionsNumber of
shares		Weighted
average
grant date
fair value
Outstanding as of January 1, 20200.3 $41.62 
Granted0.2 45.31 
Forfeited(0.1)43.30 
Outstanding as of December 31, 20200.4 $42.78