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Share-Based Compensation Plans
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation Plans
Share-Based Compensation Plans — The Northern Trust Corporation 2012 Stock Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, stock awards, restricted stock units and performance stock units.
Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the three and nine months ended September 30, 2015 and 2014.
Table 57: Total Compensation Expense for Share-Based Payment Arrangements
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In Millions)
2015
 
2014
 
2015
 
2014
Restricted Stock Unit Awards
$
11.8

 
$
12.7

 
$
38.7

 
$
41.7

Stock Options
1.3

 
2.2

 
9.0

 
10.7

Performance Stock Units
3.7

 
3.1

 
11.2

 
8.9

Total Share-Based Compensation Expense
16.8

 
18.0

 
58.9

 
61.3

Tax Benefits Recognized
$
6.4

 
$
6.8

 
$
22.2

 
$
23.0