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Supplemental Balance Sheet Information - Prepaid and Other Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Jun. 30, 2014
Balance Sheet Related Disclosures [Abstract]    
Prepaid Expense, Current $ 22.0 $ 16.6
Spare parts supplies 11.5 12.5
Deferred income taxes 19.7 12.7
Other current assets 27.7 32.8
Prepaid Expense and Other Assets, Current $ 80.9 $ 74.6