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Indebtedness (Narrative) (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Seven Point Twenty Five Percent Senior Notes due 2034 [Member] | Nov. 15, 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, 2012 Six Point Seventy Percent Senior Notes due 2035 [Member] | Nov. 03, 2005 Six Point Seventy Percent Senior Notes due 2035 [Member] | Dec. 31, 2012 Two Point Ninety Percent Borrowing From Federal Home Loan Bank due Dec. 15, 2014[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, 2006 Seven Point Fifty Percent Junior Notes due 2066 [Member] | Sep. 25, 2006 Seven Point Fifty Percent Junior Notes due 2066 [Member] | Dec. 31, 2012 Line of Credit expires Jun. 14,2014[Member]
Aggregate principal amount of notes |  |  |  | $ 50 |  |  | $ 100 |  |  |  |  | $ 100 |
Discount for notes issued |  |  |  | 0.1 |  |  | 0.7 |  |  |  |  |  |
Effective yield |  |  |  | 7.27% |  |  | 6.754% |  |  |  |  |  |
Bond proceeds to Insurance Subsidiaries as capital |  |  |  | 25 |  |  |  |  |  |  |  |  |
Acceleration of principal |  |  | 10 |  |  | 10 |  |  |  |  |  |  | 10
Net proceeds from the issuance |  |  |  |  | 50.0 |  |  |  |  |  | 96.8 |  |
Deferred interest payments |  |  |  |  |  |  |  |  |  |  |  | 10 years |
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 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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