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Net Income Per Share and Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Calculation of basic and diluted earnings per share
Basic and diluted net income per share were calculated as follows, for each period presented (in millions of dollars, except share and per share amounts):
 
Quarter Ended
 
March 31,
 
2017
 
2016
Numerator:
 
 
 
Net income
$
36.0

 
$
26.3

Denominator – Weighted-average common shares outstanding (in thousands):
 
 
 
Basic1
17,385

 
17,864

Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options
218

 
336

Diluted2
17,603

 
18,200

 
 
 
 
Net income per common share, Basic:
$
2.07

 
$
1.47

Net income per common share, Diluted:
$
2.04

 
$
1.44

______________________
1 
The basic weighted-average number of common shares outstanding during the periods presented excludes non-vested common shares, restricted stock units and performance shares.
2 
The diluted weighted-average number of common shares outstanding during the periods presented was calculated using the treasury method.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following securities were excluded from the weighted-average diluted shares computation for the quarters ended March 31, 2017 and March 31, 2016 as their inclusion would have been anti-dilutive (in thousands of shares):
 
Quarter Ended
 
March 31,
 
2017
 
2016
Options to purchase common shares
2

 
17

Non-vested common shares, restricted stock units and performance shares
64

 
33

Total excluded
66

 
50