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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Calculation of basic and diluted earnings per share
Basic and diluted net income (loss) per share were calculated as follows, for each period presented (in millions of dollars, except share and per share amounts):
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
14.9

 
$
22.1

 
$
67.2

 
$
(249.9
)
Denominator – Weighted-average common shares outstanding (in thousands):
 
 
 
 
 
 
 
Basic1
17,841

 
17,123

 
17,858

 
17,178

Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options
334

 
305

 
323

 
—

Add: dilutive effect of warrants2
—

 
744

 
—

 
—

Diluted3
18,175

 
18,172

 
18,181

 
17,178

 
 
 
 
 
 
 
 
Net income (loss) per common share, Basic:
$
0.84

 
$
1.29

 
$
3.76

 
$
(14.55
)
Net income (loss) per common share, Diluted:
$
0.82

 
$
1.21

 
$
3.70

 
$
(14.55
)
______________________
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 
Net-share-settled warrants ("Warrants") relating to approximately 1.7 million notional common shares of our common stock were outstanding at September 30, 2015 at an exercise price of approximately $60.32 per share, and were settled during a period from October 1, 2015 through December 18, 2015.
3 
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 and nine months ended September 30, 2016 and September 30, 2015 as their inclusion would have been anti-dilutive (in thousands of shares):
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Options to purchase common shares
—

 
—

 
—

 
17

Non-vested common shares, restricted stock units and performance shares
3

 
—

 
2

 
281

Warrants
—

 
—

 
—

 
773

Total excluded
3

 
—

 
2

 
1,071