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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, 2015
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost $ 134.7 $ 64.1 $ 59.7 $ 64.8
Due within one year, Amortized cost 84.6      
Due after one year through five years, Amortized cost 66.3      
Due after five years, Amortized cost 0.0      
Total 285.6 185.4    
Due within one year, Estimated fair value 84.6      
Due after one year through five years, Estimated fair value 66.2      
Due after five years, Estimated fair value 0.0      
Total 285.5 185.4    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 114.0 54.7    
Cash equivalents, Estimated fair value 114.0 54.7    
Cash Equivalents        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Amortized cost 20.7 9.4    
Cash equivalents, Estimated fair value $ 20.7 $ 9.4