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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Reconciliation of Basic and Diluted Earnings Per Share
The reconciliation of basic and diluted earnings per share on common stock for the third quarter and September year to date 2018 and 2017 follows (in millions of dollars except per share data):
 
Third Quarter
 
September Year to Date
 
2018
 
2017
 
2018
 
2017
Net earnings
$
33.1

 
$
23.0

 
$
46.8

 
$
53.9

Less: earnings allocated to participating securities
(0.4
)
 
(0.3
)
 
(0.5
)
 
(0.9
)
Net earnings available to common shareholders
$
32.7

 
$
22.7

 
$
46.3

 
$
53.0

 
 
 
 
 
 
 
 
Average shares outstanding (millions):
 
 
 
 
 
 
 
Basic
38.8

 
38.3

 
38.7

 
38.3

Dilutive share awards
0.1

 
0.5

 
0.1

 
0.5

Diluted
38.9

 
38.8

 
38.8

 
38.8

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.84

 
$
0.59

 
$
1.20

 
$
1.38

Diluted earnings per share
$
0.84

 
$
0.58

 
$
1.19

 
$
1.37