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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Summary of Restricted Stock Activity
A summary of the Company’s restricted stock activity follows:
 
2015
 
2014
 
2013
 
Shares
 
Weighted Average Grant- Date Fair Value
 
Shares
 
Weighted Average Grant- Date Fair Value
 
Shares
 
Weighted Average Grant- Date Fair Value
Restricted stock at January 1
1,184,299

 
$
41.71

 
1,463,694

 
$
31.48

 
1,771,664

 
$
23.44

Granted
218,957

 
65.16

 
229,489

 
70.24

 
331,053

 
51.99

Vested (a)
(389,481
)
 
32.77

 
(507,222
)
 
26.29

 
(605,458
)
 
19.54

Forfeitures
(5,981
)
 
66.42

 
(1,662
)
 
61.05

 
(33,565
)
 
24.76

Restricted stock at December 31
1,007,794

 
$
49.47

 
1,184,299

 
$
41.71

 
1,463,694

 
$
31.48

___________
(a)
The total fair value of awards upon vesting for the years ended December 31, 2015, 2014, and 2013 was $26.3 million, $36.4 million, and $29.5 million, respectively.
Summary of Performance Units Activity
The awards are valued at the closing price of the Company’s stock on the grant date and expensed over the requisite service period based on the most probable number of awards expected to vest.
 
2015
 
2014
 
2013
 
Units
 
Weighted Average Grant- Date Fair Value
 
Units
 
Weighted Average Grant- Date Fair Value
 
Units
 
Weighted Average Grant-Date Fair Value
Performance units at January 1
127,489

 
$
58.25

 
70,600

 
$
47.83

 
—

 
$
—

Granted
53,102

 
65.04

 
56,889

 
71.19

 
70,600

 
47.83

Vested (a)
(4,916
)
 
71.19

 
—

 
—

 
—

 
—

Forfeitures
—

 
—

 
—

 
—

 
—

 
—

Performance units at December 31
175,675

 
$
59.94

 
127,489

 
$
58.25

 
70,600

 
$
47.83
Compensation Expense For Restricted Stock and Performance Units
Compensation expense for share-based awards recognized in the Consolidated Statements of Income, net of forfeitures was as follows (dollars in millions):
 
Year Ended December 31
 
2015
 
2014
 
2013
Restricted stock
$
15.2

 
$
13.8

 
$
14.3

Performance units
3.0

 
1.8

 
0.5

Impact on income before income taxes
18.2

 
15.6

 
14.8

Income tax benefit
(7.1
)
 
(6.1
)
 
(5.8
)
Impact on net income
$
11.1

 
$
9.5

 
$
9.0
Unrecognized Compensation For Restricted Stock and Performance Units
The unrecognized compensation expense for all share-based awards was as follows (dollars in millions):
 
December 31, 2015
 
Unrecognized Compensation Expense
 
Remaining Weighted Average Recognition Period (in years)
Restricted stock
$
26.6

 
2.5
Performance units
6.2

 
2.8
Total unrecognized share-based compensation expense
$
32.8

 
2.6