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Marketable Investment Securities - Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost $ 134.7 $ 64.1 $ 59.7 $ 64.8
Gross unrealized holding gains 0.1 0.1    
Gross unrealized holding losses (0.2) (0.1)    
Amortized cost 285.6 185.4    
Estimated fair value 285.5 185.4    
Corporate Bonds and Notes        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 45.5 41.8    
Gross unrealized holding losses (0.1)      
Estimated fair value 45.4 41.8    
Municipal Bonds        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 66.5 66.3    
Gross unrealized holding gains 0.1 0.1    
Gross unrealized holding losses (0.1) (0.1)    
Estimated fair value 66.5 66.3    
Federal Agency Issues        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 38.9 13.2    
Estimated fair value 38.9 13.2    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 114.0 54.7    
Estimated fair value 114.0 54.7    
Cash Equivalents        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 20.7 9.4    
Estimated fair value 20.7 9.4    
Total Cash and Cash Equivalents        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 134.7 64.1    
Estimated fair value $ 134.7 $ 64.1