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Share-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Share-based Compensation [Abstract]  
Summary of Restricted Stock and Performance Unit Award Activity
The following table presents restricted stock and performance unit award activity for the three months ended March 31, 2017:
 
Restricted Stock
 
Performance Units
 
Shares
 
Weighted Average Grant- Date Fair Value
 
Shares
 
Weighted Average Grant- Date Fair Value
Outstanding at January 1, 2017
786,079

 
$
63.44

 
232,088

 
$
62.68

Granted
—

 
—

 
—

 
—

Vested
(18,950
)
 
67.64

 
—

 
—

Forfeitures
(2,153
)
 
64.59

 
—

 
—

Outstanding at March 31, 2017
764,976

 
$
63.33

 
232,088

 
$
62.68
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):
 
Three Months Ended March 31
 
 
2017
 
2016
 
Restricted stock
$
3.4

 
$
4.9

 
Performance units
1.2

 
0.7

 
Total share-based compensation expense
4.6

 
5.6

 
Income tax benefit
(1.8
)
 
(2.2
)
 
Share-based compensation expense, net of tax benefit
$
2.8

 
$
3.4

 
Unrecognized Compensation For Restricted Stock and Performance Units
The unrecognized compensation expense for all share-based awards at March 31, 2017 was as follows (dollars in millions):
 
March 31, 2017
 
Unrecognized Compensation Expense
 
Remaining Weighted Average Recognition Period (in years)
Restricted stock
$
23.7

 
2.6
Performance units
7.2

 
2.7
Total unrecognized share-based compensation expense
$
30.9

 
2.6