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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, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months $ 51.1 $ 29.6
Unrealized losses, Less than 12 months (0.1) 0.0
Fair Value, More than 12 months 0.0 0.0
Unrealized losses, More than 12 months 0.0 0.0
Fair value, Total 51.1 29.6
Unrealized losses, Total (0.1) 0.0
Corporate Bonds and Notes    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 24.4 16.0
Unrealized losses, Less than 12 months 0.0 0.0
Fair Value, More than 12 months 0.0 0.0
Unrealized losses, More than 12 months 0.0 0.0
Fair value, Total 24.4 16.0
Unrealized losses, Total 0.0 0.0
Municipal Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 24.8 8.6
Unrealized losses, Less than 12 months (0.1) 0.0
Fair Value, More than 12 months 0.0 0.0
Unrealized losses, More than 12 months 0.0 0.0
Fair value, Total 24.8 8.6
Unrealized losses, Total (0.1) 0.0
Federal Agency Issues    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 1.9 5.0
Unrealized losses, Less than 12 months 0.0 0.0
Fair Value, More than 12 months 0.0 0.0
Unrealized losses, More than 12 months 0.0 0.0
Fair value, Total 1.9 5.0
Unrealized losses, Total $ 0.0 $ 0.0