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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of restricted stock unit activity
The following is a summary of RSU activity under the 2011 Plan for the year ended December 31, 2019 (in millions except per share data):
 
 
Shares
 
Weighted Average Grant Date Fair Value
Nonvested at beginning of year
 
1.7

 
$
20.59

Granted
 
1.3

 
17.27

Vested
 
(0.9
)
 
20.29

Forfeited
 
(0.1
)
 
18.99

Nonvested at end of year
 
2.0

 
18.59