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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Share Based Compensation  
Summary of activity for vested and unvested stock options outstanding

Weighted-average

 

Number

Weighted-average

remaining

Aggregate

 

of shares

exercise price

contractual term

intrinsic value

 

    

under option

    

per share

    

(years)

    

(in millions)

 

Outstanding at January 1, 2019

3,767,483

$

21.56

6.84

$

Granted

1,594,528

8.35

Forfeited

(201,596)

30.93

Expired

(295,990)

60.33

Outstanding at December 31, 2019

4,864,425

$

14.48

7.34

$

Vested and exercisable at December 31, 2019

2,212,911

$

20.88

5.85

$

Service awards  
Share Based Compensation  
Summary of unvested deferred units activity

Number

Weighted-average

 

of

grant-date fair value

 

    

units

    

per unit

 

Unvested at January 1, 2019

4,077,992

$

10.40

 

Granted

3,044,494

8.33

Vested

(2,224,030)

10.40

Forfeited

(178,878)

9.01

Unvested at December 31, 2019

4,719,578

$

9.11

Performance awards  
Share Based Compensation  
Summary of unvested deferred units activity

Number

Weighted-average

 

of

grant-date fair value

 

    

units

    

per unit

 

Unvested at January 1, 2019

1,763,794

$

12.93

Granted

1,067,316

10.77

Vested

(676,098)

16.25

Forfeited

(73,393)

3.02

Unvested at December 31, 2019

2,081,619

$

10.78