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Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2013
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                          
Net realized capital gains (losses) $ 12.9 $ (2.8) $ 10.7 $ (17.4)         $ (6.7) $ (9.5) $ 3.4 $ (22.3) $ (19.4)
Income tax expense (benefit) (5.5) 2.6 (16.9) (1.9) [1] (7.4) 4.3 0.5 18.8 (18.8) (16.2) (21.7) 16.2 (6.3)
Reclassification out of Accumulated Other Comprehensive Income [Member]
                         
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                          
Net income (loss)                     5.7 12.6 (0.9)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net unrealized investment gains
                         
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                          
Net realized capital gains (losses)                     0.9 0.9 0.4
Total before income taxes                     0.9 0.9 0.4
Income tax expense (benefit)                     0.3 0.3 0.1
Net income (loss)                     0.6 0.6 0.3
Reclassification out of Accumulated Other Comprehensive Income [Member] | Non-credit portion of OTTI losses recognized in OCI [Member]
                         
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                          
Net realized capital gains (losses)                     7.8 18.5 (1.8)
Total before income taxes                     7.8 18.5 (1.8)
Income tax expense (benefit)                     2.7 6.5 (0.6)
Net income (loss)                     $ 5.1 $ 12.0 $ (1.2)
[1] Results for the quarter ended March 31, 2013 include $3.2 million of income (loss) related to out of period adjustments. Such amounts are not material to any period presented.