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Net Loss Per Share and Shareholders' Equity
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Net Loss Per Share and Shareholders' Equity
Net Earnings (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
)

The diluted EPS calculation for the three and six months ended June 30, 2018 excludes the effect of 0.9 million outstanding stock options as their effect is anti-dilutive and 0.2 million outstanding performance stock units as the performance criteria has not yet been achieved. The diluted EPS calculation for the three months ended June 30, 2017 excludes 1.5 million outstanding stock options as their effect is anti-dilutive. The diluted EPS calculation for the three and six months ended June 30, 2017 excludes the effect of 0.1 million outstanding performance stock units as the performance criteria has not yet been achieved. The diluted EPS calculation for the six months ended June 30, 2017 excludes the effect of 0.6 million shares of restricted stock, 0.2 million restricted stock units and 5.0 million outstanding stock options as their effect is anti-dilutive. Holders of non-vested stock-based compensation awards do not have voting rights or rights to receive nonforfeitable dividends on the shares covered by the awards.