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Stockholders' Equity Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Nonvested stock rollforward
Activity under the Company’s nonvested stock awards and restricted share units for the years ended December 31, 2018, 2017, and 2016 was as follows:
(Shares in thousands, $ in millions)
 
2018
 
2017
 
2016
 
 
Number of
shares/units
 
Weighted
Average
Grant Date
Fair Value
 
Number of
shares/units
 
Weighted
Average Grant
Date Fair
Value
 
Number of
shares
 
Weighted
Average Grant
Date Fair
Value
Nonvested, beginning of year
 
1,320

 
$
32.5

 
1,852

 
$
51.5

 
1,652

 
$
57.0

Granted
 
290

 
7.8

 
378

 
7.1

 
682

 
8.4

Vested
 
(540
)
 
(11.7
)
 
(591
)
 
(16.9
)
 
(154
)
 
(4.3
)
Forfeited
 
(15
)
 
(0.3
)
 
(319
)
 
(9.2
)
 
(328
)
 
(9.6
)
Nonvested, end of year
 
1,055

 
$
28.3

 
1,320

 
$
32.5

 
1,852

 
$
51.5