Share Plans (Tables)

6 Months Ended

Jun. 30, 2022

Share-based Payment Arrangement [Abstract]

Share-based Compensation Expense

Total share-based compensation expense for the three and six months ended June 30, 2022 and 2021 was as follows:

	Three months ended				Six months ended
In millions	June 30, 2022		June 30, 2021		June 30, 2022		June 30, 2021
Restricted stock units	$	3.3	$	3.6	$	6.9	$	7.0
Stock options	0.9		0.9		1.9		1.8
Performance share units	2.1		6.5		4.4		7.8
Total share-based compensation expense	$	6.3	$	11.0	$	13.2	$	16.6

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:

	2022 Annual Grant
Risk-free interest rate	1.18	%
Expected dividend yield	1.14	%
Expected share price volatility	29.60	%
Expected term (years)	6.4