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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Calculation of basic and diluted earnings per share
Basic and diluted net (loss) 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,
 
2015
 
2014
Numerator:
 
 
 
Net (loss) income
$
(292.2
)
 
$
15.8

Denominator - Weighted-average common shares outstanding (in thousands):
 
 
 
Basic1
17,344

 
17,921

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

 
122

Add: dilutive effect of warrants
—

 
471

Diluted2
17,344

 
18,514

 
 
 
 
Net (loss) income per common share, Basic:
$
(16.85
)
 
$
0.88

Net (loss) income per common share, Diluted:
$
(16.85
)
 
$
0.85

______________________
1 
The basic weighted-average number of common shares outstanding during the periods excludes non-vested common shares, restricted stock units and performance shares.
2 
The diluted weighted-average number of common shares outstanding during the period was calculated using the treasury method.