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Contingencies, Guarantees and Indemnifications (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Loss contingencies - disclosures
Maximum exposure under guarantees	$ 138.0
Guaranty Funds
Undiscounted liability balance for guaranty fund assessments	38.7	14.5
Premium tax offsets	$ 22.6	$ 6.9

The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations.

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