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Employee Benefit Plans
 6 Months Ended
Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Compensation and Employee Benefit Plans
Stock-based Compensation Plans
    
The Company's share-based compensation consists of stock options, time-based restricted stock, time-based restricted stock units, performance-based restricted stock, and performance-based restricted stock units. The Company also offers an employee stock purchase plan for eligible employees.

The Company currently utilizes treasury stock to satisfy stock option exercises, issuances under the Company's employee stock purchase plan, and restricted stock awards.  From time to time, the Company may repurchase shares of its common stock under its authorized share repurchase programs.  The Company repurchased 1.4 million and 4.6 million shares in the three months ended December 31, 2017 and 2016, respectively and repurchased 3.6 million and 8.6 million shares in the six months ended December 31, 2017 and 2016, respectively. The Company considers several factors in determining when to execute share repurchases, including, among other things, actual and potential acquisition activity, cash balances and cash flows, issuances due to employee benefit plan activity, and market conditions.

The following table represents stock-based compensation expense for the three and six months ended December 31, 2017 and 2016, respectively:
 
Three Months Ended
 
Six Months Ended
 
December 31,
 
December 31,
 
2017
 
2016
 
2017
 
2016
Operating expenses
$
5.4

 
$
6.3

 
$
10.6

 
$
11.8

Selling, general and administrative expenses
27.5

 
24.3

 
56.1

 
45.9

System development and programming costs
5.8

 
5.2

 
11.0

 
9.2

Total stock-based compensation expense
$
38.7

 
$
35.8

 
$
77.7

 
$
66.9



The methods and assumptions used in the determination of the fair value of stock-based awards are consistent with those described in the Company's fiscal 2017 Form 10-K. See the Company's Annual Report on Form 10-K for fiscal 2017 for a detailed description of the Company's stock-based compensation awards and employee stock purchase plan, including information related to vesting terms, service and performance conditions, payout percentages, and process for estimating the fair value of stock options granted.
Employee Benefit Plans
Pension Plans

The components of net pension expense were as follows:
 
Three Months Ended
 
 
Six Months Ended
 
December 31,
 
 
December 31,
 
2017
 
2016
 
 
2017
 
2016
Service cost – benefits earned during the period
$
18.6

 
$
20.2

 
 
$
37.3

 
$
40.4

Interest cost on projected benefits
16.3

 
14.9

 
 
32.6

 
30.0

Expected return on plan assets
(34.3
)
 
(33.9
)
 
 
(68.6
)
 
(67.9
)
Net amortization and deferral
2.1

 
4.8

 
 
4.2

 
9.6

Net pension expense
$
2.7

 
$
6.0

 
 
$
5.5

 
$
12.1