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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share, Basic and Diluted [Abstract]  
Basic and Diluted Earnings (Loss) Per Share
Basic and diluted earnings per share were calculated as follows:
 
Years ended December 31
In millions, except per share data
2019
2018
2017
Net income
$
355.7

$
347.4

$
666.5

Net income from continuing operations
$
361.7

$
321.7

$
114.1

Weighted average ordinary shares outstanding
 
 
 
Basic
169.4

175.8

181.7

Dilutive impact of stock options and restricted stock awards
1.0

1.5

2.0

Diluted
170.4

177.3

183.7

Earnings per ordinary share
 
 
 
Basic
 
 
 
Continuing operations
$
2.14

$
1.83

$
0.63

Discontinued operations
(0.04
)
0.15

3.04

Basic earnings per ordinary share
$
2.10

$
1.98

$
3.67

Diluted
 
 
 
Continuing operations
$
2.12

$
1.81

$
0.62

Discontinued operations
(0.03
)
0.15

3.01

Diluted earnings per ordinary share
$
2.09

$
1.96

$
3.63

Anti-dilutive stock options excluded from the calculation of diluted earnings per share
2.1

1.2

1.8