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Net Loss Per Share and Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation of Numerator and Denominator of the Basic and Diluted Net Loss Per Share
The following is a reconciliation of the numerator and denominator of the basic and diluted net (loss) earnings per share ("EPS") computations:
 
 
Three Months Ended March 31,
 
 
2017
 
2016
 
(in millions, except common share and per common share amounts)
Numerator:
 
 
 
 
Net (loss) earnings
 
$
(24.6
)
 
$
9.8

Denominator:
 
 
 
 
Denominator for basic EPS–weighted-average common shares
 
68,260,015

 
67,179,348

Dilutive effect of stock-based compensation arrangements
 
—

 
2,496,120

Denominator for diluted EPS–adjusted weighted-average common shares
 
68,260,015

 
69,675,468

 
 
 
 
 
Basic EPS
 
$
(0.36
)
 
$
0.15

Diluted EPS
 
$
(0.36
)
 
$
0.14