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Incentive Compensation Plans Schedule of Stock-based Compensation Expense (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement, Additional Disclosure [Abstract]  
Schedule of Stock-based Compensation Expense
The amounts of stock-based compensation expense as reflected in salaries and related expenses in our Consolidated Statements of Operations, and the related tax benefit, are listed below.
 
Years ended December 31,
 
2019
 
2018
 
2017
Stock-settled awards
$
33.5

 
$
24.7

 
$
20.5

Cash-settled awards
0.8

 
0.6

 
1.0

Performance-based awards
46.7

 
57.5

 
61.5

Employee stock purchase plan
1.1

 
0.9

 
1.0

Other 1
0.6

 
0.9

 
0.5

Stock-based compensation expense
$
82.7

 
$
84.6

 
$
84.5

Tax benefit
$
20.0

 
$
20.4

 
$
30.4

 
1
Represents charges recorded for severance expense related to stock-based compensation awards.