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Shareholders' Equity (Deficit) (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of information relating to common stock activity
The following table sets forth information relating to common stock activity for the years ended December 31, 2019, 2018, and 2017:
(In millions, except shares)
Number of Shares
 
Aggregate Proceeds
Balance of outstanding shares, December 31, 2016
68,309,431

 
 
Stock options exercised
386,300

 
$
16.4

Shares issued
49,897

 
 
Shares forfeited through net share exercise
(29,783
)
 
 
Shares repurchased
(935,435
)
 
 
Balance of outstanding shares, December 31, 2017
67,780,410

 
 
Stock options exercised
243,502

 
$
6.7

Shares issued
72,590

 
 
Shares forfeited through net share exercise
(132,393
)
 
 
Shares repurchased
(1,171,141
)
 
 
Balance of outstanding shares, December 31, 2018
66,792,968

 
 
Stock options exercised
388,174

 
$
19.1

Shares issued
94,796

 
 
Shares forfeited through net share exercise
(130,256
)
 
 
Shares repurchased
(409,769
)
 
 
Balance of outstanding shares, December 31, 2019
66,735,913