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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Options Roll Forward
A summary of award activity by type for the six months ended June 30, 2020 is presented below.
Stock Options
 
Awards
(in millions)
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
 (in millions)
 
Weighted
Average
Remaining
Contractual
Life (years)
Outstanding at January 1, 2020
 
3.0

 
$
25.92

 
 
 
 
Granted
 
—

 
$
—

 
 
 
 
Exercised (1)
 
—

 
$
14.61

 
 
 
 
Forfeited (1)
 
—

 
$
28.24

 
 
 
 
Outstanding at June 30, 2020
 
3.0

 
$
26.27

 
 
 
 
Vested and expected to vest at June 30, 2020
 
3.0

 
$
26.27

 
$
5.4

 
5.24
Exercisable at June 30, 2020
 
2.4

 
$
25.94

 
$
5.4

 
4.49

(1)
Activity during the six months ended June 30, 2020 rounds to zero.
Schedule of Restricted Stock Units and Restricted Stock Awards Roll Forward
Restricted Stock Awards and Restricted Stock Units
 
Awards/Units
(millions)
 
Weighted-Average
Fair Value
Outstanding at January 1, 2020
 
1.2

 
$
28.45

Granted
 
0.4

 
$
29.73

Vested
 
(0.4
)
 
$
28.35

Forfeited
 
(0.1
)
 
$
28.13

Outstanding at June 30, 2020
 
1.1

 
$
29.03
Schedule of Performance Stock Roll Forward
Performance Stock Awards and Performance Share Units
 
Awards/Units
(millions)
 
Weighted-Average
Fair Value
Outstanding at January 1, 2020
 
0.5

 
$
32.11

Granted
 
0.4

 
$
31.88

Vested
 
(0.1
)
 
$
38.11

Forfeited
 
(0.1
)
 
$
32.95

Outstanding at June 30, 2020
 
0.7

 
$
31.14