Fair Value Measurements - Significant Unobservable Inputs (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Actuarial Assumptions, Lapses, threshold percentage	85.00%
Actuarial Assumptions, Policyholder Deposits, threshold percentage	85.00%
Fixed indexed annuities (FIA) | Investment contract | Market Approach Valuation Technique | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Nonperformance risk	(0.10%)	[1]	(0.10%)	[1]
Actuarial Assumptions, Lapses	0.00%	[1],[2]	0.00%	[1],[2]
Fixed indexed annuities (FIA) | Investment contract | Market Approach Valuation Technique | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Nonperformance risk	0.79%	[1]	0.79%	[1]
Actuarial Assumptions, Lapses	10.00%	[1],[2]	10.00%	[1],[2]
Stabilizer / MCG
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Percentage of Plans	100.00%		100.00%
Stabilizer / MCG | Derivative Financial Instruments, Liabilities | Market Approach Valuation Technique | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Interest rate implied volatility	0.20%	[1]	0.20%	[1]
Nonperformance risk	(0.10%)	[1]	(0.10%)	[1]
Actuarial Assumptions, Lapses	0.00%	[1],[3]	0.00%	[1],[3]
Actuarial Assumptions, Policyholder Deposits	0.00%	[1],[3],[4]	0.00%	[1],[3],[4]
Actuarial Assumptions, Lapses under percent threshold	0.00%	[1],[3]	0.00%
Actuarial Assumptions, Policyholder Deposits under percent threshold	0.00%	[1],[3]	0.00%
Stabilizer / MCG | Derivative Financial Instruments, Liabilities | Market Approach Valuation Technique | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Interest rate implied volatility	7.60%	[1]	8.00%	[1]
Nonperformance risk	0.79%	[1]	0.79%	[1]
Actuarial Assumptions, Lapses	55.00%	[1],[3]	55.00%	[1],[3]
Actuarial Assumptions, Policyholder Deposits	60.00%	[1],[3],[4]	60.00%	[1],[3],[4]
Actuarial Assumptions, Lapses under percent threshold	25.00%	[1],[3]	25.00%
Actuarial Assumptions, Policyholder Deposits under percent threshold	30.00%	[1],[3]	30.00%
Stabilizer (Investment Only) and MCG Contracts
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Percentage of Plans	88.00%		88.00%
Stabilizer (Investment Only) and MCG Contracts | Derivative Financial Instruments, Liabilities | Market Approach Valuation Technique | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Actuarial Assumptions, Lapses	0.00%	[1],[3]	0.00%
Actuarial Assumptions, Policyholder Deposits	0.00%	[1],[3]	0.00%
Actuarial Assumptions, Lapses under percent threshold	0.00%	[1],[3]	0.00%
Actuarial Assumptions, Policyholder Deposits under percent threshold	0.00%	[1],[3]	0.00%
Stabilizer (Investment Only) and MCG Contracts | Derivative Financial Instruments, Liabilities | Market Approach Valuation Technique | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Actuarial Assumptions, Lapses	30.00%	[1],[3]	30.00%
Actuarial Assumptions, Policyholder Deposits	55.00%	[1],[3]	55.00%
Actuarial Assumptions, Lapses under percent threshold	15.00%	[1],[3]	15.00%
Actuarial Assumptions, Policyholder Deposits under percent threshold	15.00%	[1],[3]	15.00%
Stabilizer with Recordkeeping Agreements
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Percentage of Plans	12.00%		12.00%
Stabilizer with Recordkeeping Agreements | Derivative Financial Instruments, Liabilities | Market Approach Valuation Technique | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Actuarial Assumptions, Lapses	0.00%	[1],[3]	0.00%
Actuarial Assumptions, Policyholder Deposits	0.00%	[1],[3]	0.00%
Actuarial Assumptions, Lapses under percent threshold	0.00%	[1],[3]	0.00%
Actuarial Assumptions, Policyholder Deposits under percent threshold	0.00%	[1],[3]	0.00%
Stabilizer with Recordkeeping Agreements | Derivative Financial Instruments, Liabilities | Market Approach Valuation Technique | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Actuarial Assumptions, Lapses	55.00%	[1],[3]	55.00%
Actuarial Assumptions, Policyholder Deposits	60.00%	[1],[3]	60.00%
Actuarial Assumptions, Lapses under percent threshold	25.00%	[1],[3]	25.00%
Actuarial Assumptions, Policyholder Deposits under percent threshold	30.00%	[1],[3]	30.00%

[1] Represents the range of reasonable assumptions that management has used in its fair value calculations.

[2] Lapse rates tend to be lower during the contractual surrender charge period and higher after the surrender charge period ends; the highest lapse rates occur in the year immediately after the end of the surrender charge period. The Company makes dynamic adjustments to lower the lapse rates for contracts that are more "in the money."

[3] Stabilizer contracts with recordkeeping agreements have different range of lapse and policyholder deposit assumptions from Stabilizer (Investment only) and MCG contracts as shown below: Percentage of Plans Overall Range of Lapse Rates Range of Lapse Rates for 85% of Plans Overall Range of Policyholder Deposits Range of Policyholder Deposits for 85% of PlansStabilizer (Investment Only) and MCG Contracts88% 0-30% 0-15% 0-55% 0-15%Stabilizer with Recordkeeping Agreements12% 0-55% 0-25% 0-60% 0-30%Aggregate of all plans100% 0-55% 0-25% 0-60% 0-30%

[4] Measured as a percentage of assets under management or assets under administration.