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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Basic and Dilutive Earnings (Loss) Per Share Our calculations for basic and dilutive earnings (loss) per share for the years ended December 31, 2019, 2018, and 2017 are as follows:

 

(dollars in millions, except per share data, shares and stock units in thousands)

 

2019

 

 

2018

 

 

2017

 

Basic and dilutive net income (loss)

 

$

(104.0

)

 

$

20.2

 

 

$

(10.8

)

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic weighted average shares outstanding

 

 

33,252

 

 

 

32,983

 

 

 

32,685

 

Effect of dilutive securities:

 

 

 

 

 

 

 

 

 

 

 

 

Unvested shares and stocks units(a)

 

 

—

 

 

 

876

 

 

 

—

 

Dilutive weighted average shares outstanding

 

 

33,252

 

 

 

33,859

 

 

 

32,685

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic earnings (loss) per share(b)

 

$

(3.13

)

 

$

0.61

 

 

$

(0.33

)

Diluted earnings (loss) per share(b)

 

$

(3.13

)

 

$

0.60

 

 

$

(0.33

)

 

 

(a)

Includes unvested shares of Common Stock, unvested stock units, and vested stock units for which the underlying Common Stock has not been distributed.

 

(b)

Earnings (loss) per share is based on unrounded figures and not the rounded figures presented.
Schedule of Antidilutive Securities

Our anti-dilutive securities for the years ended December 31 are as follows:

 

(shares in thousands)

 

2019

 

 

2018

 

 

2017

 

Anti-dilutive unvested shares and options

 

 

610

 

 

 

51

 

 

 

8