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Earnings Per Share
 9 Months Ended
Oct. 01, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
The reconciliation of basic and diluted earnings per share on common stock for the third quarter and September year to date 2017 and 2016 follows (in millions of dollars except per share data):
 
Third Quarter
 
September Year to Date
 
2017
 
2016
 
2017
 
2016
Net earnings
$
23.0

 
$
80.9

 
$
53.9

 
$
101.0

Less: earnings allocated to participating securities
(0.3
)
 
(1.8
)
 
(0.9
)
 
(2.3
)
Net earnings available to common shareholders
$
22.7

 
$
79.1

 
$
53.0

 
$
98.7

 
 
 
 
 
 
 
 
Average shares outstanding (millions):
 
 
 
 
 
 
 
Basic
38.3

 
38.1

 
38.3

 
38.0

Dilutive share awards
0.5

 
0.3

 
0.5

 
0.3

Diluted
38.8

 
38.4

 
38.8

 
38.3

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.59

 
$
2.08

 
$
1.38

 
$
2.59

Diluted earnings per share
$
0.58

 
$
2.06

 
$
1.37

 
$
2.58


Potentially dilutive shares outstanding are primarily related to performance shares for the third quarter and September year to date 2017 and 2016. Stock options excluded from the computation of diluted earnings per share due to their anti-dilutive effect for September year to date 2016 were not significant, and all remaining stock options expired in the second quarter 2016.