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Share Plans (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Compensation Expense
Total share-based compensation expense for the three and nine months ended September 30, 2020 and 2019 was as follows:
Three months ended    Nine months ended
In millionsSeptember 30,
2020		September 30,
2019		September 30,
2020		September 30,
2019
Restricted stock units$3.0 $2.5 $9.3 $8.2 
Stock options0.6 0.9 2.2 3.4 
Performance share units1.2 1.2 3.7 3.7 
Total share-based compensation expense$4.8 $4.6 $15.2 $15.3 
Schedule of Share-based Payment Award, Stock Options, Valuation 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:
 2020
Annual Grant
Risk-free interest rate1.61 %
Expected dividend yield1.80 %
Expected share price volatility24.10 %
Expected term (years)6.8