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Indebtedness (Narrative) (Details) (USD $) In Millions, unless otherwise specified |  |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Five Point Eight Hundred Seventy Five [Member] | Mar. 31, 2013 Redemption Of Seven Point Fifty Percent Junior Notes [Member] | Dec. 31, 2013 Seven Point Twenty Five Percent Senior Notes due 2034 [Member] | Dec. 31, 2004 Seven Point Twenty Five Percent Senior Notes due 2034 [Member] | Dec. 31, 2005 Six Point Seventy Percent Senior Notes due 2035 [Member] | Dec. 31, 2013 Six Point Seventy Percent Senior Notes due 2035 [Member] | Dec. 31, 2009 Two Point Ninety Percent Borrowing From Federal Home Loan Bank due Dec. 15, 2014[Member] | Dec. 31, 2011 One Point Twenty Five Percent Borrowing From Federal Home Loan Bank due Dec. 16, 2016 [Member] | Dec. 31, 2013 Line of Credit expires Sept 26,2017 [Member]
Aggregate principal amount of notes |  |  | $ 185 | $ 100 |  | $ 50 | $ 100 |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  | 3.3 |  |  |  |  |  |  |
Discount for notes issued |  |  |  |  |  | 0.1 | 0.7 |  |  |  |
Effective yield |  |  |  |  |  | 7.27% | 6.754% |  |  |  |
Bond proceeds to Insurance Subsidiaries as capital |  |  | 57.1 |  |  | 25.0 |  |  |  |  |
Acceleration of principal |  |  |  |  | 10 |  |  | 10 |  |  | 20
Net proceeds from the issuance |  |  |  |  |  |  | 50 |  |  |  |
Aggregate investment in FHLBI | 2.9 | 2.9 |  |  |  |  |  |  |  |  |
Borrowing threshold of FHLBI | 20 |  |  |  |  |  |  |  |  |  |
FLHBI Borrowing | (58.0) |  |  |  |  |  |  |  | 13.0 | 45.0 |
Unpaid principal amount interest rate |  |  |  |  |  |  |  |  | 2.90% | 1.25% |
Line of credit borrowing capacity |  |  |  |  |  |  |  |  |  |  | 30
Line of credit, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 50
Maximum FHLBI borrowing percentage permitted by line of credit | 10.00% |  |  |  |  |  |  |  |  |  |

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument. + References No definition available. + Details
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- Definition States the amount of the aggregate investment in the Federal Home Loan Bank common stock outstanding as of the Balance Sheet date. + References No definition available. + Details
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- Definition This amount is a multiple of the Company's aggregate investment in the Federal Home Loan Bank representing the Company's ability to borrow from the Federal Home Loan Bank. + References No definition available. + Details
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- Definition The maximum collaterized borrowing percentage of the subsidiary's admitted assets from the Federal Home Loan Bank that are permitted by the Line of Credit. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823 + Details
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