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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Net Income Per Share
 
Year ended December 31,
(in millions, except per share amounts)
2017
 
2016
 
 
 
 
Net income (loss) allocable to common stockholders
$
5.3

 
$
(67.0
)
 
 
 
 
Average common shares outstanding - basic
9.1

 
9.1

Potentially dilutive shares related to stock options (a)
—

 
—

Average common shares outstanding - diluted
9.1

 
9.1

 
 
 
 
Net income (loss) per common share – basic and diluted
$
0.58

 
$
(7.36
)
 
 
 
 
(a) Common stock equivalents related to stock options were less than 0.1 million shares for the year ended December 31, 2017. For the year ended December 31, 2016, common stock equivalents of less than 0.1 million shares are excluded from the diluted calculation as a result of the net loss.