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Auction Rate Securities - ARS Investments (Detail) - Auction Rate Securities Investments [Member] - USD ($) $ in Millions | Dec. 31, 2015 | Jun. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Original Cost Basis | $ 18.5 |  | $ 19.1 |
Other-than- temporary Impairment in Retained Earnings | (10.2) |  | (11.2) |
New Cost Basis | 8.3 |  | 7.9 |
Unrealized Gain | 5.9 |  | 7.9 |
Fair Value | 14.2 |  | 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 | (5.2) | [1] | (6.1) | [2]
New Cost Basis | 8.3 |  | 7.4 |
Unrealized Gain | 4.1 |  | 5.0 |
Fair Value | 12.4 |  | 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 | 1.8 |  | 2.8 |
Fair Value | $ 1.8 |  | 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.

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