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Share Plans
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share Plans
Share Plans
Total share-based compensation expense for the three months ended March 31, 2018 and 2017 was as follows:
 
Three months ended
In millions
March 31,
2018
March 31,
2017
Restricted stock units
$
2.4

$
5.8

Stock options
1.2

4.5

Performance share units
2.4

6.1

Total share-based compensation expense
$
6.0

$
16.4
Share-based Compensation Expense
Total share-based compensation expense for the three months ended March 31, 2018 and 2017 was as follows:
 
Three months ended
In millions
March 31,
2018
March 31,
2017
Restricted stock units
$
2.4

$
5.8

Stock options
1.2

4.5

Performance share units
2.4

6.1

Total share-based compensation expense
$
6.0

$
16.4