Share Plans (Tables)

9 Months Ended

Sep. 30, 2024

Share-Based Payment Arrangement [Abstract]

Total share-based compensation expense for the three and nine months ended September 30, 2024 and 2023 was as follows:


	Three months ended				Nine months ended
In millions	September 30, 2024		September 30, 2023		September 30, 2024		September 30, 2023
Restricted stock units	$	4.4	$	3.9	$	12.5	$	11.3
Stock options	1.3		1.1		4.0		3.2
Performance share units	4.3		2.2		9.8		6.8
Total share-based compensation expense	$	10.0	$	7.2	$	26.3	$	21.3

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:


	2024 Annual Grant
Risk-free interest rate	4.44	%
Expected dividend yield	1.43	%
Expected share price volatility	30.90	%
Expected term (years)	6.5