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Stockholders' Equity Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Nonvested stock rollforward
Activity under the Company’s nonvested stock awards for the years ended December 31, 2015, 2014, and 2013 was as follows:
(Shares in thousands, $ in millions)
 
2015
 
2014
 
2013
 
 
Number of
shares
 
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
 
1,376

 
$
47.8

 
927

 
$
36.9

 
727

 
$
38.6

Granted
 
669

 
20.8

 
675

 
20.3

 
576

 
16.4

Vested
 
(23
)
 
(0.8
)
 
(18
)
 
(1.0
)
 
(333
)
 
(16.4
)
Forfeited
 
(370
)
 
(10.8
)
 
(208
)
 
(8.4
)
 
(43
)
 
(1.7
)
Nonvested, end of year
 
1,652

 
$
57.0

 
1,376

 
$
47.8

 
927

 
$
36.9
Tsr/Tsrp Award Performance
The estimated fair value of each performance equity 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 / TSRP Award Performance Period
 
Award
Fair Value
 
December 31, 2015
Unrecognized
Compensation
Expense
 
Minimum
Shares
 
Target
Shares
 
Maximum
Shares
2013 - 2015
 
$
10.5

 
$
—

 
—

 
296

 
592

2014 - 2016
 
$
9.3

 
3.1

 
—

 
277

 
554

2015 - 2017
 
$
13.4

 
8.9

 
—

 
296

 
592

Total
 
 
 
$
12.0

 
—

 
869

 
1,738