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Auction Rate Securities - ARS Investments (Detail) - Auction Rate Securities Investments [Member] - USD ($)
$ in Millions
Sep. 30, 2015
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis $ 18.5 $ 19.1
Other-than- temporary Impairment in Retained Earnings (10.6) (11.2)
New Cost Basis 7.9 7.9
Unrealized Gain 7.1 7.9
Fair Value 15.0 15.8
Credit Linked Notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 13.5 13.5
Other-than- temporary Impairment in Retained Earnings (5.6) [1] (6.1) [2]
New Cost Basis 7.9 7.4
Unrealized Gain 4.6 5.0
Fair Value 12.5 12.4
Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 5.0 5.0
Other-than- temporary Impairment in Retained Earnings (5.0) (5.0)
Unrealized Gain 2.5 2.8
Fair Value $ 2.5 2.8
Municipals [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis   0.6
Other-than- temporary Impairment in Retained Earnings   (0.1)
New Cost Basis   0.5
Unrealized Gain   0.1
Fair Value   $ 0.6
[1] Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $3.1 million on non-current investments. Accretion is reclassified from accumulated other comprehensive income and recorded in the condensed consolidated statements of income as non-cash interest income.
[2] Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $2.7 million on non-current investments. Accretion is reclassified from accumulated other comprehensive income and recorded in the condensed consolidated statements of income as non-cash interest income.