Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 71,291.7	$ 73,746.6
Loans	6,882.5	6,793.1
Derivatives	1,538.5	1,819.6
Derivatives	487.5	849.3
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement	4,669.4	5,069.3
Derivatives	1,538.5	1,819.6
Other investments	91.6	110.3
Assets held in separate accounts	96,514.8	106,007.8
Other derivatives	487.5	849.3
Long-term debt	3,485.9	3,515.7
Carrying Value \| Reinsurance agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	25.2	139.6
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, short-term investments and short-term investments under securirites loan agreement	4,669.4	5,069.3
Derivatives	1,538.5	1,819.6
Other investments	101.5	120.4
Assets held in separate accounts	96,514.8	106,007.8
Other derivatives	487.5	849.3
Long-term debt	3,772.7	3,875.4
Fair Value \| Reinsurance agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	25.2	139.6
Funding agreements without fixed maturities and deferred annuities(1) \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	51,361.7	49,791.9
Funding agreements without fixed maturities and deferred annuities(1) \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	56,884.4	55,112.4
Funding agreements with fixed maturities and guaranteed investment contracts \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,488.5	1,593.0
Funding agreements with fixed maturities and guaranteed investment contracts \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,463.1	1,564.8
Supplementary contracts, immediate annuities and other \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	2,948.1	2,535.3
Supplementary contracts, immediate annuities and other \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	3,162.8	2,706.2
FIA \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,820.1	1,970.0
FIA \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,820.1	1,970.0
Embedded Derivative Indexed Universal Life \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	52.6	0.0
Embedded Derivative Indexed Universal Life \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	52.6	0.0
GMAB/GMWB/GMWBL \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,873.5	1,527.7
GMAB/GMWB/GMWBL \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,873.5	1,527.7
Stabilizer and MCGs \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	161.3	102.9
Stabilizer and MCGs \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	161.3	102.9
Mortgage loans on real estate \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	10,447.5	9,794.1
Mortgage loans on real estate \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	10,881.4	10,286.6
Policy loans \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,002.7	2,104.0
Policy loans \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,002.7	2,104.0
Fixed maturities, available-for-sale, including securities pledged \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	72,072.6	74,659.4
Fixed maturities, available-for-sale, including securities pledged \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	72,072.6	74,659.4
Equity securities, available-for-sale \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	331.7	271.8
Equity securities, available-for-sale \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 331.7	$ 271.8

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

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