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Accounting Policies and Recent Accounting Pronouncements - Foreign Currency (Details) - USD ($) $ in Millions | 12 Months Ended
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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)

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