Investments OTTI OCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Investments, Debt and Equity Securities [Abstract]
Balance, beginning	$ 60.5	$ 85.8	$ 64.1	$ 118.2
Additional credit impairments on securities not previously impaired	0	2.7	0.4	3.2
Additional credit impairments on securities previously impaired	1.8	2.6	4.3	4.8
Reductions, Securities intent impairments	0	0	0	(3.4)
Reductions, Securities sold, maturied, prepaid or paid down	(18.8)	(27.1)	(25.3)	(58.8)
Balance, ending	$ 43.5	$ 64.0	$ 43.5	$ 64.0

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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This item represents reductions in the amount of cumulative losses recognized in earnings for other than temporary impairments (OTTI) for which a portion of the impairment had been recognized in other comprehensive income (a component of shareholders' equity) due to a change in status of the impaired security because of a change in the entity's intent to either sell the impaired security or it has become more likely than not that the entity will be required to sell the security before recovery of its cost basis.

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