Share Plans (Tables)

3 Months Ended

Mar. 31, 2023

Share-Based Payment Arrangement [Abstract]

Share-based Compensation Expense

Total share-based compensation expense for the three months ended March 31, 2023 and 2022 was as follows:

	Three months ended
In millions	March 31, 2023		March 31, 2022
Restricted stock units	$	3.7	$	3.6
Stock options	1.1		1.0
Performance share units	2.4		2.3
Total share-based compensation expense	$	7.2	$	6.9

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 rate	4.00	%
Expected dividend yield	2.02	%
Expected share price volatility	30.4	%
Expected term (years)	6.1