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Marketable Investment Securities - Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost $ 68.5 $ 64.1 $ 64.8 $ 104.1
Due within one year, Amortized cost 90.5      
Due after one year through five years, Amortized cost 79.4      
Due after five years, Amortized cost 0.0      
Total 238.4 185.4    
Due within one year, Estimated fair value 90.5      
Due after one year through five years, Estimated fair value 79.9      
Due after five years, Estimated fair value 0.0      
Total 238.9 185.4    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 66.1 54.7    
Cash equivalents, Estimated fair value 66.1 54.7    
Cash Equivalents        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 2.4 9.4    
Cash equivalents, Estimated fair value $ 2.4 $ 9.4