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Operating Leases - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Leases, Operating [Abstract]      
Rent expense total $ 13.4 $ 13.2 $ 11.3
Future minimum payments for non-cancellable operating leases, 2019 9.1    
Future minimum payments for non-cancellable operating leases, 2020 7.0    
Future minimum payments for non-cancellable operating leases, 2021 3.9    
Future minimum payments for non-cancellable operating leases, 2022 2.9    
Future minimum payments for non-cancellable operating leases, 2023 2.7    
Future minimum payments for non-cancellable operating leases, thereafter $ 2.9