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Employee Retirement Benefit Plans (Tables)
 6 Months Ended
Dec. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of Company's Net Periodic Benefit Costs
Components of the Company’s net periodic benefit costs are as follows:
 
Three Months Ended  
 December 31,
 
Six Months Ended  
 December 31,
(Dollars in millions)
2016
 
2015
 
2016
 
2015
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
0.8

 
$
0.7

 
$
1.6

 
$
1.4

Interest cost
1.6

 
2.7

 
3.3

 
5.4

Expected return on plan assets
(2.6
)
 
(2.5
)
 
(5.4
)
 
(5.1
)
Amortization (1)
1.0

 
0.7

 
2.1

 
1.4

Net amount recognized
$
0.8

 
$
1.6

 
$
1.6

 
$
3.1

(1)
Amount represents the amortization of unrecognized actuarial gains/(losses).