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Investment Securities (Net Investment Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Investment income
Total investment income	$ 33.0	$ 44.8
Third-party investment expenses	(4.5)	(3.0)
Net investment income	28.5	41.8
Fixed maturity investments.
Investment income
Total investment income	26.0	36.7
Short-term investments
Investment income
Total investment income	0.8	1.0
Common Stock
Investment income
Total investment income	4.7	4.4
Convertible fixed maturity investments
Investment income
Total investment income	0.8	1.9
Other long-term investments
Investment income
Total investment income	0.7	0.8
Interest on funds held under reinsurance treaties
Investment income
Total investment income	$ 0	$ 0

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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