Investments - Narrative (Details) (Preferred Stock, USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2013
Preferred Stock
Schedule of Trading Securities and Other Trading Assets
Fair value of trading securities in unrealized gain position	$ 5.2	$ 7.3
Fair value of trading securities in unrealized loss position	$ 16.4	$ 13.2

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant