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Auction Rate Securities - ARS Investments (Detail) - Auction Rate Securities Investments [Member] - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis $ 12.5 $ 12.5
Other-than- temporary Impairment in Retained Earnings (6.9) (7.2)
New Cost Basis 5.6 5.3
Unrealized Gain 3.0 3.3
Fair Value 8.6 8.6
Credit Linked Notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 7.5 7.5
Other-than- temporary Impairment in Retained Earnings (1.9) [1] (2.2) [2]
New Cost Basis 5.6 5.3
Unrealized Gain 1.5 1.8
Fair Value 7.1 7.1
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 1.5 1.5
Fair Value $ 1.5 $ 1.5
[1] Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $4.7 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.
[2] Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $4.4 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.