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Statutory Insurance Financial Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statutory disclosures
Impact of prescribed and permitted practices on statutory capital and surplus	$ 267.4
Statutory net income	326.8	404.6	42.1
Statutory capital and surplus	$ 4,218.2	$ 4,377.8	$ 4,588.7

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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