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Commitments and Contingencies (Tables)
 12 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future minimum rental payments for operating leases
The future minimum rental payments for operating leases having initial or remaining non-cancelable lease terms in excess of one year at June 30, 2017 are:
(Dollars in millions)
2018
2019
2020
2021
2022
Thereafter
Total
Minimum rental payments
$
11.0

$
7.3

$
6.5

$
5.7

$
4.8

$
16.9

$
52.2