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7. Investing Activities (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
As restated and amended [Member]
Sep. 30, 2011
As restated and amended [Member]
Balance, beginning of period $ (20.0) $ (21.3) $ (20.0) $ (19.9)
Add: Credit losses on securities not previously impaired (1) (0.2) (0.5)    (0.5)
Add: Credit losses on securities previously impaired (1) (0.4) (1.4) (0.7) (0.8)
Less: Credit losses on securities impaired due to intent to sell            
Less: Credit losses on securities sold 1.0 3.6 0.3 0.8
Less: Increases in cash flows expected on previously impaired securities            
Balance, end of period $ (19.6) $ (19.6) $ (20.4) $ (20.4)