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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%