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Loss Per Share Loss Per Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Loss Per Share
Loss Per Share
Basic loss per share is computed by dividing net loss for the period by the weighted average number of common stock outstanding during the period. Diluted loss per share is computed by dividing net loss for the period by the weighted average number of shares of common stock and potentially dilutive common stock outstanding during the period. The dilutive effect of outstanding options and equity incentive awards is reflected in diluted loss per share by application of the treasury stock method. The calculation of diluted loss per share excludes all anti-dilutive common stock. The following table sets forth the computation of basic and diluted loss per share.
(U.S. dollars in millions, except per share amounts)
Year Ended December 31
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Basic and diluted:
 
 
 
 
 
Net loss attributable to common shareholders
$
(276
)
 
$
(217
)
 
$
(53
)
 
 
 
 
 
 
Denominator:
 
 
 
 
 
Basic: Weighted average number of shares outstanding (in millions)
87.16

 
87.13

 
87.13

Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions)1
87.16

 
87.13

 
87.13

 
 
 
 
 
 
Basic loss per share
$
(3.17
)
 
$
(2.49
)
 
$
(0.61
)
Diluted loss per share1
$
(3.17
)
 
$
(2.49
)
 
$
(0.61
)
1
Shares in the diluted loss per share calculation represent basic shares due to the net loss. The shares excluded from the calculation were 446,821 for the year ended December 31, 2018, because they are anti-dilutive and for the years ended December 31, 2017 and 2016, the shares excluded were zero.