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Employee Retirement Benefit Plans (Tables)
 9 Months Ended
Mar. 31, 2017
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  
 March 31,
 
Nine Months Ended  
 March 31,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
0.8

 
$
0.7

 
$
2.4

 
$
2.1

Interest cost
1.6

 
2.6

 
4.9

 
8.0

Expected return on plan assets
(2.7
)
 
(2.4
)
 
(8.1
)
 
(7.5
)
Amortization (1)
1.1

 
0.6

 
3.2

 
2.0

Net amount recognized
$
0.8

 
$
1.5

 
$
2.4

 
$
4.6

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