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Share Plans (Tables)
 9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Share-based Compensation Expense
Total share-based compensation expense for the three and nine months ended September 30, 2023 and 2022 was as follows:
Three months ended    Nine months ended
In millionsSeptember 30,
2023		September 30,
2022		September 30,
2023		September 30,
2022
Restricted stock units$3.9 $4.1 $11.3 $11.0 
Stock options1.1 1.1 3.2 3.0 
Performance share units2.2 2.2 6.8 6.6 
Total share-based compensation expense$7.2 $7.4 $21.3 $20.6 
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:
 2023
Annual Grant
Risk-free interest rate4.00 %
Expected dividend yield2.02 %
Expected share price volatility30.40 %
Expected term (years)6.1