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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Basic and Diluted Earnings Per Share
Basic and diluted earnings per share were calculated as follows:
 
Three months ended    
 
Six months ended
In millions, except per-share data
June 30,
2018
June 30,
2017
 
June 30,
2018
June 30,
2017
Net income
$
41.5

$
263.7

 
$
144.4

$
351.5

Net income from continuing operations
$
77.9

$
(3.4
)
 
$
136.3

$
9.3

Weighted average ordinary shares outstanding
 
 
 
 
 
Basic
176.9

181.7

 
178.1

181.9

Dilutive impact of stock options, restricted stock units and performance share units
1.7

2.1

 
1.8

2.0

Diluted
178.6

183.8

 
179.9

183.9

Earnings (loss) per ordinary share
 
 
 
 
 
Basic
 
 
 
 
 
Continuing operations
$
0.44

$
(0.02
)
 
$
0.77

$
0.05

Discontinued operations
(0.21
)
1.47

 
0.04

1.88

Basic earnings per ordinary share
$
0.23

$
1.45

 
$
0.81

$
1.93

Diluted
 
 
 
 
 
Continuing operations
$
0.44

$
(0.02
)
 
$
0.76

$
0.05

Discontinued operations
(0.21
)
1.45

 
0.04

1.86

Diluted earnings per ordinary share
$
0.23

$
1.43

 
$
0.80

$
1.91

Anti-dilutive stock options excluded from the calculation of diluted earnings per share
0.7

1.7

 
0.5

1.9