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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]  
Earnings (Loss) Per Share
Earnings (Loss) Per Share
Basic and diluted earnings (loss) per share were calculated as follows:
 
Years ended December 31
In millions, except per share data
2017
2016
2015
Net income (loss)
$
666.5

$
522.2

$
(76.4
)
Net income from continuing operations
$
480.0

$
451.6

$
397.1

Weighted average ordinary shares outstanding
 
 
 
Basic
181.7

181.3

180.3

Dilutive impact of stock options and restricted stock awards
2.0

1.8

2.3

Diluted
183.7

183.1

182.6

Earnings (loss) per ordinary share
 
 
 
Basic
 
 
 
Continuing operations
$
2.64

$
2.49

$
2.20

Discontinued operations
1.03

0.39

(2.62
)
Basic earnings (loss) per ordinary share
$
3.67

$
2.88

$
(0.42
)
Diluted
 
 
 
Continuing operations
$
2.61

$
2.47

$
2.17

Discontinued operations
1.02

0.38

(2.59
)
Diluted earnings (loss) per ordinary share
$
3.63

$
2.85

$
(0.42
)
Anti-dilutive stock options excluded from the calculation of diluted earnings per share
1.8

1.2

1.3