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Net Loss Per Share and Shareholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
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 earnings (loss) per share ("EPS") computations:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions, except common share and per common share amounts)
Numerator:
 
 
 
 
 
 
 
Net earnings (loss)
$
14.9

 
$
10.1

 
$
20.8

 
$
(14.5
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic EPS–weighted-average common shares
69,646,435

 
68,500,028

 
69,432,137

 
68,380,684

Dilutive effect of stock-based compensation arrangements
2,057,285

 
2,438,490

 
2,193,326

 
—

Denominator for diluted EPS–adjusted weighted-average common shares
71,703,720

 
70,938,518

 
71,625,463

 
68,380,684

 
 
 
 
 
 
 
 
Basic EPS
$
0.21

 
$
0.15

 
$
0.30

 
$
(0.21
)
Diluted EPS
$
0.21

 
$
0.14

 
$
0.29

 
$
(0.21
)