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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Common Stock Reconciliation of Basic and Diluted Earnings Per Share
The reconciliation of basic earnings per share on common stock for the year-end 2017, 2016 and 2015 follows (in millions of dollars except per share data).
 
2017
 
2016
 
2015
Net earnings
$
71.6

 
$
120.8

 
$
53.8

Less: Earnings allocated to participating securities
(1.1
)
 
(2.6
)
 
(1.4
)
Net earnings available to common shareholders
$
70.5

 
$
118.2

 
$
52.4

 
 
 
 
 
 
Average common shares outstanding (millions):
 
 
 
 
 
Basic
38.3

 
38.1

 
37.8

Dilutive share awards
0.7

 
0.3

 
0.1

Diluted
39.0

 
38.4

 
37.9

 
 
 
 
 
 
Basic earnings per share
$
1.84

 
$
3.10

 
$
1.39

Diluted earnings per share
$
1.81

 
$
3.08

 
$
1.39