Share Plans (Tables)

6 Months Ended

Jun. 30, 2024

Share-Based Payment Arrangement [Abstract]

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


	Three months ended				Six months ended
In millions	June 30, 2024		June 30, 2023		June 30, 2024		June 30, 2023
Restricted stock units	$	4.3	$	3.7	$	8.1	$	7.4
Stock options	1.3		1.0		2.7		2.1
Performance share units	2.8		2.2		5.5		4.6
Total share-based compensation expense	$	8.4	$	6.9	$	16.3	$	14.1

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