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Basic and Diluted Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Summary of Number of Participating Securities and Earning Allocations to those Securities The following table presents the number of participating securities and earnings allocated to those securities for the years ended December 31, 2019, 2018 and 2017 (in millions):

 

 

2019

 

 

2018

 

 

2017

 

Earnings allocated to participating shareholders

 

$

—

 

 

$

—

 

 

$

-

 

Number of participating securities

 

 

0.8

 

 

 

0.9

 

 

 

1.1

 

 
Summary of Diluted Earning Per Share The following table presents the number of common shares used in the calculation of net loss per share from continuing operations for the years ended December 31, 2019, 2018 and 2017 (in millions):

 

 

2019

 

 

2018

 

 

2017

 

Weighted-average number of common shares-basic

 

 

25.4

 

 

 

25.1

 

 

 

24.9

 

Dilutive potential common shares

 

 

—

 

 

 

—

 

 

 

—

 

Weighted-average number of common shares-dilutive

 

 

25.4

 

 

 

25.1

 

 

 

24.9