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Accounting Policies and Recent Accounting Pronouncements - Foreign Currency (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Other Income (Expense)      
Intercompany Foreign Currency Balance [Line Items]      
Transactional foreign currency gains (losses) $ 4.8 $ 3.1 $ (1.9)