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EMPLOYEE STOCK BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-Based Compensation Expense by Award Type
The following table summarizes stock-based compensation expense related to stock options, performance share awards and restricted stock units.
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(Dollars in millions)
 
2016
 
2015
 
2016
 
2015
Stock options
 
$
3.3

 
$
2.0

 
$
5.4

 
$
3.9

Performance share awards
 
2.3

 
1.1

 
4.6

 
5.5

Restricted stock units
 
4.4

 
3.4

 
7.8

 
6.1

Total pre-tax stock-based compensation expense
 
$
10.0

 
$
6.5

 
$
17.8

 
$
15.5

Net tax benefit related to stock-based compensation expense
 
$
(3.3
)
 
$
(2.1
)
 
$
(6.0
)
 
$
(5.2
)
Awards Granted and Weighted-Average Grant Date Fair Value of Options Granted
During the six months ended June 30, 2016, the Company granted the following awards: 
(Shares in millions)
 
Options/Shares Granted
 
Weighted-
Average Grant
Date Fair Value
Stock options
 
1.1

 
$
13.88

Performance share awards
 
0.2

 
$
70.49

Restricted stock units
 
0.4

 
$
74.48
Unrecognized Compensation Costs of Outstanding Share Awards
As of June 30, 2016, the Company had the following award expense yet to be recognized: 
(Dollars in millions)
 
Unrecognized
Compensation
Expense
 
Expected
Weighted-Average
Period to be
Recognized
(years)
Stock options
 
$
16.9

 
1.9
Performance share awards
 
8.2

 
1.4
Restricted stock units
 
42.6

 
2.7
 
 
$
67.7