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Schedule II Condensed Financial Information of Registrant Parent Company Balance Sheet (Parenthetical) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 37,751.5	$ 36,640.7
Parent Company [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 217.7	$ 167.7

Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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