Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 73,746.6us-gaap_AvailableForSaleSecurities	$ 71,567.5us-gaap_AvailableForSaleSecurities
Loans	6,793.1	4,965.3
Derivatives	1,819.6us-gaap_DerivativeAssets	1,149.3us-gaap_DerivativeAssets
Derivatives	849.3us-gaap_DerivativeLiabilities	1,351.8us-gaap_DerivativeLiabilities
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Limited partnerships/corporations	363.2	236.4
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement	5,069.3	4,441.8
Derivatives	1,819.6	1,149.3
Other investments	110.3	124.6
Assets held in separate accounts	106,007.8	106,827.1
Other derivatives	849.3	1,351.8
Long-term debt	3,515.7	3,514.7
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Limited partnerships/corporations	363.2	236.4
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement	5,069.3	4,441.8
Derivatives	1,819.6	1,149.3
Other investments	120.4	131.1
Assets held in separate accounts	106,007.8	106,827.1
Other derivatives	849.3	1,351.8
Long-term debt	3,875.4	3,717.8
Funding agreements without fixed maturities and deferred annuities(1) \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	49,850.9	49,418.4
Funding agreements without fixed maturities and deferred annuities(1) \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	55,171.4	53,713.8
Funding agreements with fixed maturities and guaranteed investment contracts \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,593.0	2,692.3
Funding agreements with fixed maturities and guaranteed investment contracts \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,564.8	2,663.9
Supplementary contracts, immediate annuities and other \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	2,535.3	2,003.8
Supplementary contracts, immediate annuities and other \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	2,706.2	2,042.5
FIA \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,970.0	1,736.7
FIA \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,970.0	1,736.7
GMAB/GMWB/GMWBL \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,586.7	908.9
GMAB/GMWB/GMWBL \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,586.7	908.9
Stabilizer and MCGs \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	102.9	0
Stabilizer and MCGs \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	102.9	0
Mortgage loans on real estate \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	9,794.1	9,312.2
Mortgage loans on real estate \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	10,286.6	9,404.7
Policy loans \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,104.0	2,147.0
Policy loans \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,104.0	2,147.0
Fixed maturities, available-for-sale, including securities pledged \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	74,659.4	72,718.8
Fixed maturities, available-for-sale, including securities pledged \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	74,659.4	72,718.8
Equity securities, available-for-sale \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	271.8	314.4
Equity securities, available-for-sale \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	271.8	314.4
Reinsurance agreements \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	139.6	79.0
Reinsurance agreements \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	$ 139.6	$ 79.0

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of investments accounted under the equity method.

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Fair value portion of liability related to investment contracts for example, but not limited to, guaranteed investment contract or annuities.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Cash, Cash Equivalents, Short-term Investments and Short-term Investments Under Securities Loan Agreement, Fair Value Disclosure

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