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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, 2017
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost $ 102.4 $ 68.5 $ 64.1 $ 64.8
Due within one year, Amortized cost 48.3      
Due after one year through five years, Amortized cost 48.6      
Due after five years, Amortized cost 0.0      
Total, Amortized cost 199.3 238.4    
Due within one year, Estimated fair value 48.3      
Due after one year through five years, Estimated fair value 48.5      
Due after five years, Estimated fair value 0.0      
Total, Estimated fair value 199.2 238.9    
Cash [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 83.5 66.1    
Cash equivalents, Estimated fair value 83.5 66.1    
Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 18.9 2.4    
Cash equivalents, Estimated fair value $ 18.9 $ 2.4