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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Reconciliation of information used in computing basic and diluted earnings per share
Basic and diluted earnings per share was computed as follows (in millions except share and per share amounts):
 
Years Ended December 31,
 
    2015 (1)
 
    2014 (2)
 
    2013 (2)
Net (loss) earnings
$
(233.8
)
 
$
(87.0
)
 
$
105.8

 
 
 
 
 
 
Basic (loss) earnings per common share:
 
 
 
 
 
Basic weighted-average shares outstanding
86,802,828

 
85,046,042

 
85,019,159

Basic (loss) earnings per share
$
(2.69
)
 
$
(1.02
)
 
$
1.24

 
 
 
 
 
 
Diluted (loss) earnings per common share:
 
 
 
 
 
Basic weighted-average shares outstanding
86,802,828

 
85,046,042

 
85,019,159

Dilutive effect of stock-based awards
—

 
—

 
—

Diluted weighted-average shares outstanding
86,802,828

 
85,046,042

 
85,019,159

 
 
 
 
 
 
Diluted (loss) earnings per share
$
(2.69
)
 
$
(1.02
)
 
$
1.24