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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
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost $ 108.1 $ 68.5 $ 134.7 $ 64.1
Due within one year, Amortized cost 54.4      
Due after one year through five years, Amortized cost 55.8      
Due after five years, Amortized cost 0.0      
Total 218.3 238.4    
Due within one year, Estimated fair value 54.4      
Due after one year through five years, Estimated fair value 55.5      
Due after five years, Estimated fair value 0.0      
Total 218.0 238.9    
Cash [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 81.3 66.1    
Cash equivalents, Estimated fair value 81.3 66.1    
Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 26.8 2.4    
Cash equivalents, Estimated fair value $ 26.8 $ 2.4