Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Cash Flows [Abstract]
Net income (loss)	$ 325.4	$ 320.3	$ 377.9
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Capitalization of deferred policy acquisition costs, value of business acquired and sales inducements	(88.1)	(88.9)	(93.9)
Net amortization of deferred policy acquisition costs, value of business acquired and sales inducements	133.1	97.7	(37.3)
Net accretion/amortization of discount/premium	20.7	37.0	44.3
Future policy benefits, claims reserves and interest credited	569.9	639.0	608.8
Deferred income tax expense (benefit)	9.5	(65.3)	33.6
Net realized capital (gains) losses	(59.3)	215.8	18.8
Depreciation	3.5	3.5	3.4
Accrued investment income	(12.8)	(19.7)	(23.3)
Reinsurance recoverable	122.6	79.6	74.0
Other receivables and asset accruals	(44.8)	(3.5)	(86.0)
Due to/from affiliates	(77.8)	54.3	17.2
Other payables and accruals	125.0	(91.9)	85.5
Other, net	60.9	(64.8)	(36.1)
Net cash provided by operating activities	1,087.8	1,113.1	986.9
Proceeds from the sale, maturity, disposal or redemption of:
Fixed maturities	3,868.7	6,468.5	6,340.3
Equity securities, available-for-sale	2.4	63.1	12.9
Mortgage loans on real estate	492.2	332.8	179.2
Limited partnerships/corporations	339.4	93.0	87.2
Acquisition of:
Fixed maturities	(5,484.7)	(7,662.0)	(7,383.5)
Equity securities, available-for-sale	(0.7)	(5.7)	(16.7)
Mortgage loans on real estate	(991.3)	(863.1)	(147.2)
Limited partnerships/corporations	(46.1)	(68.5)	(85.5)
Derivatives, net	(36.4)	(78.6)	(147.3)
Policy loans, net	5.0	7.1	1.7
Short-term investments, net	(463.0)	5.3	313.1
Loan-Dutch State obligation, net	416.8	122.4	134.7
Collateral received	57.1	105.3	4.7
Purchases of fixed assets, net	(0.6)	(0.8)	0
Net cash used in investing activities	(1,841.2)	(1,481.2)	(706.4)
Cash Flows from Financing Activities:
Deposits received for investment contracts	2,884.3	3,115.4	2,022.2
Maturities and withdrawals from investment contracts	(2,292.6)	(2,403.6)	(2,309.7)
Short-term loans to affiliates, net	648.0	(343.9)	(16.9)
Short-term repayments of repurchase agreements, net	0	(214.7)	214.6
Dividends paid and return of capital distribution	(340.0)	0	(203.0)
Capital contribution from parent	0	201.0	0
Net cash provided by (used in) financing activities	899.7	354.2	(292.8)
Net increase (decrease) in cash and cash equivalents	146.3	(13.9)	(12.3)
Cash and cash equivalents, beginning of year	217.1	231.0	243.3
Cash and cash equivalents, end of year	363.4	217.1	231.0
Supplemental cash flow information:
Income taxes paid	170.1	108.4	0.6
Interest paid	$ 0	$ 0.3	$ 0