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Marketable Investment Securities - Schedule of Debt Securities Available-For-Sale in Gross Unrealized Loss Position (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months $ 18.6 $ 51.1
Unrealized losses, Less than 12 months   (0.1)
Fair Value, More than 12 months 7.8  
Unrealized losses, More than 12 months 0.0 0.0
Fair value, Total 26.4 51.1
Unrealized losses, Total   (0.1)
Corporate Bonds and Notes    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 5.0 24.4
Unrealized losses, Less than 12 months   0.0
Fair Value, More than 12 months 1.5  
Unrealized losses, More than 12 months 0.0 0.0
Fair value, Total 6.5 24.4
Unrealized losses, Total   0.0
Municipal Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 7.6 24.8
Unrealized losses, Less than 12 months   (0.1)
Fair Value, More than 12 months 6.3  
Unrealized losses, More than 12 months 0.0 0.0
Fair value, Total 13.9 24.8
Unrealized losses, Total   (0.1)
Federal Agency Issues    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 6.0 1.9
Unrealized losses, Less than 12 months   0.0
Unrealized losses, More than 12 months 0.0 0.0
Fair value, Total 6.0 1.9
Unrealized losses, Total   $ 0.0
US Government Securities    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, More than 12 months $ 0.0