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EMPLOYEE STOCK BENEFIT PLANS (Tables)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock-based compensation expense by award type
 
 
Three Months Ended March 31,
(In millions)
 
2015
 
2014
Stock options
 
$
1.9

 
$
1.7

Performance share awards
 
4.4

 
3.2

Restricted stock units
 
2.7

 
2.4

Total pre-tax stock-based compensation expense
 
$
9.0

 
$
7.3

Net tax benefit related to stock-based compensation expense
 
$
(3.1
)
 
$
(2.6
)
Awards Granted and Weighted-Average Grant Date Fair Value of Options Granted
(Shares in millions)
 
Shares Granted
 
Weighted-
Average Grant
Date Fair Value
Stock options
 
0.4

 
$
20.64

Performance share awards
 
0.2

 
$
99.41

Restricted stock units
 
0.2

 
$
104.21

Unrecognized Compensation Costs Of Outstanding Share Awards
(Dollars in millions)
 
Unrecognized
Compensation
Expense
 
Expected
Weighted-Average
Period to be
Recognized
(years)
Stock options
 
$
14.1

 
2.1
Performance share awards
 
$
21.8

 
1.6
Restricted stock units
 
$
35.6

 
2.7