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Investments - Narrative (Details) (Preferred Stock, USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2012
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Preferred Stock |  |  |
Schedule of Trading Securities and Other Trading Assets |  |  |
Fair value of trading securities in unrealized gain position | $ 10.7 |  | $ 7.3
Fair value of trading securities in unrealized loss position | $ 9.7 | $ 13.2 |

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