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Statutory Requirements of Bonds Deposited with Insurance Regulatory Authorities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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Regulatory Capital Requirements [Abstract] |  |
Assets held by insurance regulators | $ 16.4 | $ 16.1

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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485772&loc=d3e22002-158495 + Details
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