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Equity and Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings (Loss) Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted earnings (loss) per share (in millions, except per share data).
 
Year Ended December 31,
 
2017
 
2016
 
2015
Basic and diluted earnings (loss) per share:
 
 
 
 
 
Numerator:
 
 
 
 
 
Net income (loss), basic and diluted
$
160.3

 
$
(19.7
)
 
$
111.3

Denominator:
 
 
 
 
 
Basic weighted average common shares
28.3

 
28.3

 
30.2

Stock options, RSUs and PSUs(a)
0.3

 
—

 
—

Weighted average shares used to calculate diluted earnings (loss) per share
28.6

 
28.3

 
30.2

Earnings (loss) per share:
 
 
 
 
 
Basic
$
5.66

 
$
(0.70
)
 
$
3.69

Diluted
$
5.60

 
$
(0.70
)
 
$
3.69

Antidilutive stock options, RSUs and PSUs(a)
0.4

 
0.3

 
—

(a) The dilutive impact of stock options, RSUs and PSUs for the years ended December 31, 2016 and 2015 and antidilutive impact for the year ended 2015, rounds to zero for each period.