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Earnings Per Share
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
Basic and diluted earnings per share were calculated as follows:
 
Three months ended
In millions, except per-share data
March 31,
2019
March 31,
2018
Net income
$
51.3

$
102.9

Net income from continuing operations
$
52.4

$
58.4

Weighted average ordinary shares outstanding
 
 
Basic
171.6

179.2

Dilutive impact of stock options, restricted stock units and performance share units
0.9

2.3

Diluted
172.5

181.5

Earnings (loss) per ordinary share
 
 
Basic
 
 
Continuing operations
$
0.31

$
0.33

Discontinued operations
(0.01
)
0.24

Basic earnings per ordinary share
$
0.30

$
0.57

Diluted
 
 
Continuing operations
$
0.30

$
0.32

Discontinued operations
—

0.25

Diluted earnings per ordinary share
$
0.30

$
0.57

Anti-dilutive stock options excluded from the calculation of diluted earnings per share
1.7

0.4