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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
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost $ 86.9 $ 68.5 $ 87.4 $ 64.1
Due within one year, Amortized cost 61.5      
Due after one year through five years, Amortized cost 52.0      
Due after five years, Amortized cost 0.0      
Total 200.4 238.4    
Due within one year, Estimated fair value 61.5      
Due after one year through five years, Estimated fair value 52.2      
Due after five years, Estimated fair value 0.0      
Total 200.6 238.9    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 61.1 66.1    
Cash equivalents, Estimated fair value 61.1 66.1    
Cash Equivalents        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 25.8 2.4    
Cash equivalents, Estimated fair value $ 25.8 $ 2.4