Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)	Jun. 30, 2016	Apr. 05, 2016	Jun. 30, 2015
Senior Notes due June 15, 2016 [Member] \| Senior Notes [Member]
Stated interest rate (percent)	6.375%	6.375%	6.375%
Junior Subordinated Debentures due 2056 [Member] \| Junior Subordinated Debt [Member]
Stated interest rate (percent)	6.125%	6.125%	6.125%

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant