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Closed Block (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in maximum future earnings of the Closed Block
Maximum future earnings to be recognized from Closed Block assets and liabilities, Beginning of year	$ 847.6	$ 913.5	$ 967.7
Maximum future earnings to be recognized from Closed Block assets and liabilities, End of year	787.0	847.6	913.5
Closed Block revenues, net of Closed Block expenses, income taxes and funding adjustment charges	$ (60.6)	$ (65.9)	$ (54.2)

The carrying amount of closed block liabilities in excess of the carrying amount of closed block assets at the date of demutualization (adjusted to eliminate the impact of related amounts in accumulated other comprehensive income).

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