Deferred Policy Acquisition Costs ("DAC") and Value of Business Acquired ("VOBA") - Value of Business Acquired (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Movement Analysis Of Value of Business Acquired VOBA [Roll Forward]
Balance at January 1	$ 593.7	$ 719.6
Deferrals of commissions and expenses	4.0	4.0
Amortization:
Amortization	(111.2)	(89.7)
Interest accrued at 5% to 8%	33.4	35.9
Net amortization included in Condensed Consolidated Statemetns of Operations	(77.8)	(53.8)
Change in unrealized capital gains/losses on availabe-for-sale securities	(43.9)	(19.3)
Balance at June 30	$ 476.0	$ 650.5
Minimum
Amortization:
Value of Business Acquired, Interest Accrued Percentage	5.00%
Maximum
Amortization:
Value of Business Acquired, Interest Accrued Percentage	8.00%

The adjustment that represents the periodic charge against earnings to reduce the value of business acquired (VOBA) over the expected life of the underlying insurance contracts. VOBA reflects the estimated fair value of a life insurance business in force and represents the portion of the cost to acquire the business that is allocated to the value of the right to receive future cash flows from insurance contracts existing at the date of acquisition. Such value is the present value of the actuarially determined projected cash flows for the acquired policies. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The remaining unamortized carrying amount as of the balance sheet date of expected future earnings from insurance contracts acquired (also known as present value of future profits).

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