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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, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost $ 123.8 $ 68.5 $ 120.5 $ 64.1
Due within one year, Amortized cost 48.3      
Due after one year through five years, Amortized cost 52.0      
Due after five years, Amortized cost 1.5      
Total, Amortized cost 225.6 238.4    
Due within one year, Estimated fair value 48.3      
Due after one year through five years, Estimated fair value 51.9      
Due after five years, Estimated fair value 1.5      
Total, Estimated fair value 225.5 238.9    
Cash [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 106.6 66.1    
Cash equivalents, Estimated fair value 106.6 66.1    
Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 17.2 2.4    
Cash equivalents, Estimated fair value $ 17.2 $ 2.4