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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Net Income Per Share
 
Three Months Ended 
 March 31,
 
2018
 
2017
Net income (loss) allocable to common stockholders (in millions)
$
(27.0
)
 
$
6.6

 
 
 
 
Shares in thousands:
 
 
 
Average common shares outstanding - basic
9,103

 
9,063

Potentially dilutive shares related to stock options (a)
—

 
111

Average common shares outstanding - diluted
9,103

 
9,174

 
 
 
 
Net income (loss) per common share (in dollars):
 
 
 
Basic
$
(2.97
)
 
$
0.73

Diluted
$
(2.97
)
 
$
0.72