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Stockholders' Equity Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Nonvested stock rollforward
Activity under the Company’s nonvested stock awards and restricted share units for the years ended December 31, 2016, 2015, and 2014 was as follows:
(Shares in thousands, $ in millions)
 
2016
 
2015
 
2014
 
 
Number of
shares/units
 
Weighted
Average
Grant Date
Fair Value
 
Number of
shares
 
Weighted
Average Grant
Date Fair
Value
 
Number of
shares
 
Weighted
Average Grant
Date Fair
Value
Nonvested, beginning of year
 
1,652

 
$
57.0

 
1,376

 
$
47.8

 
927

 
$
36.9

Granted
 
682

 
8.4

 
669

 
20.8

 
675

 
20.3

Vested
 
(154
)
 
(4.3
)
 
(23
)
 
(0.8
)
 
(18
)
 
(1.0
)
Forfeited
 
(328
)
 
(9.6
)
 
(370
)
 
(10.8
)
 
(208
)
 
(8.4
)
Nonvested, end of year
 
1,852

 
$
51.5

 
1,652

 
$
57.0

 
1,376

 
$
47.8
TSR Award Performance
The estimated fair value of each TSR award, the projected shares to be awarded and future compensation expense to be recognized for these awards, including actual and estimated forfeitures, was as follows:
(Shares in thousands, $ in millions)
TSR Award Performance Period
 
Award
Fair Value
 
December 31, 2016
Unrecognized
Compensation
Expense
 
Minimum
Shares
 
Target
Shares
 
Maximum
Shares
2014 - 2016
 
$
8.9

 
$
—

 
—

 
262

 
524

2015 - 2017
 
$
12.5

 
4.2

 
—

 
276

 
552

Total
 
 
 
$
4.2

 
—

 
538

 
1,076