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Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Fair Value [Line Items]    
Debt Instrument, Fair Value Disclosure $ 996.4 $ 704.0
Contracts Translated to U S Dollars [Member]    
Fair Value [Line Items]    
Derivative, Notional Amount 62.9 75.3
Estimated Amount Of Receivable On Settlement Of Foreign Exchange Contracts 0.8 (0.8)
Foreign Exchange Contract [Member]    
Fair Value [Line Items]    
Derivative, Notional Amount $ 62.9 $ 75.3