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Marketable Investment Securities - Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale Securities (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost $ 120.5 $ 64.1 $ 55.2 $ 64.8
Due within one year, Amortized cost 96.2      
Due after one year through five years, Amortized cost 69.4      
Due after five years, Amortized cost 0.0      
Total 286.1 185.4    
Due within one year, Estimated fair value 96.2      
Due after one year through five years, Estimated fair value 69.7      
Due after five years, Estimated fair value 0.0      
Total 286.4 185.4    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 114.2 54.7    
Cash equivalents, Estimated fair value 114.2 54.7    
Cash Equivalents        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 6.3 9.4    
Cash equivalents, Estimated fair value $ 6.3 $ 9.4