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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 Computations
The following table provides a reconciliation of basic and diluted earnings per share computations for the three and nine months ended September 30, 2018 and 2017:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(Millions of dollars, except share amounts)
2018
 
2017
 
2018
 
2017
Earnings per common share:
 
 
 
 
 
 
 
Net income (loss) per share - basic
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
45.0

 
$
67.9

 
$
136.1

 
$
120.4

 
 
 
 
 
 
 
 
Weighted average common shares outstanding (in thousands)
32,213

 
35,423

 
32,815

 
36,253

 
 
 
 
 
 
 
 
Earnings per common share
$
1.40

 
$
1.92

 
$
4.15

 
$
3.32

 
 
 
 
 
 
 
 
 
Earnings per common share - assuming dilution:
 
 
 
 
 
 
 
Net income (loss) per share - diluted
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
45.0

 
$
67.9

 
$
136.1

 
$
120.4

 
 
 
 
 
 
 
 
Weighted average common shares outstanding (in thousands)
32,213

 
35,423

 
32,815

 
36,253

Common equivalent shares:
 
 
 
 
 
 
 
Dilutive share-based awards
323

 
322

 
327

 
326

Weighted average common shares outstanding - assuming dilution (in thousands)
32,536


35,745

 
33,142

 
36,579

 
 
 
 
 
 
 
 
Earnings per common share assuming dilution
$
1.38

 
$
1.90

 
$
4.11

 
$
3.29