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Net Earnings (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Compilation of Basic and Diluted Net (Loss) Per Common Share The following table sets forth the compilation of basic and diluted net (loss) earnings per common share for the years ended December 31, 2017, 2016 and 2015:
(millions, except per share amounts)
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net (loss) earnings for basic net earnings per common share
$
(10.7
)
 
$
21.0

 
$
51.2

Adjusted net (loss) earnings for dilutive net (loss) earnings per common share
$
(10.7
)
 
$
21.0

 
$
51.2

Denominator:
 
 
 
 
 
Weighted average shares for basic net (loss) earnings per common share
42.1

 
41.6

 
41.1

Effect of dilutive share-based awards
—

 
0.4

 
0.5

Adjusted weighted average shares for diluted net (loss) earnings per common share
42.1

 
42.0

 
41.6

 
 
 
 
 
 
Basic net (loss) earnings per common share
$
(0.25
)
 
$
0.50

 
$
1.25

Diluted net (loss) earnings per common share
$
(0.25
)
 
$
0.50

 
$
1.23

 
 
 
 
 
 
Options to Purchase Shares of Common Stock The following table sets forth the options to purchase shares of common stock and the restricted share units (“RSU award”) provided to each outside director of the Company, that were not included in the computation of diluted earnings per common share because the exercise price of the options, or awards, was greater than the average market price or their inclusion would have been antidilutive for the years ended December 31, 2017, 2016 and 2015:
(millions)
2017
 
2016
 
2015
Total number of antidilutive options and awards
0.5

 
1.2

 
1.5