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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Reconciliation of Basic and Diluted Earnings Per Share
The reconciliation of basic and diluted earnings (loss) per share on common stock for the second quarter and June year to date 2019 and 2018 follows (in millions of dollars except per share data):
 
Second Quarter
 
June Year to Date
 
2019
 
2018
 
2019
 
2018
Net earnings (loss)
$
83.8

 
$
(15.4
)
 
$
105.9

 
$
13.7

Less: earnings allocated to participating securities
(0.8
)
 
—

 
(1.0
)
 
(0.2
)
Net earnings (loss) available to common shareholders
$
83.0

 
$
(15.4
)
 
$
104.9

 
$
13.5

 
 
 
 
 
 
 
 
Average shares outstanding (millions):
 
 
 
 
 
 
 
Basic
39.1

 
38.8

 
39.0

 
38.7

Dilutive share awards
0.1

 
—

 
0.2

 
0.1

Diluted
39.2

 
38.8

 
39.2

 
38.8

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
2.12

 
$
(0.40
)
 
$
2.69

 
$
0.35

Diluted earnings (loss) per share
$
2.12

 
$
(0.40
)
 
$
2.68

 
$
0.35