Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	$ 70,239.0	$ 69,468.7
Equity securities, available-for-sale	304.0	274.2
Loans	1,636.0	1,952.5
Derivatives	1,396.6	1,712.4
Other investments	54.0	47.4
Assets held in separate accounts	102,990.8	97,118.7
Derivatives	408.1	470.7
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	76,037.8	75,338.1
Equity securities, available-for-sale	304.0	274.2
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement	4,057.5	4,520.1
Derivatives	1,396.6	1,712.4
Other investments	54.0	47.4
Assets held in separate accounts	102,990.8	97,118.7
Short-term debt	735.9	0.0
Long-term debt	2,726.2	3,549.5
Carrying Value \| Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	408.1	470.7
Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	113.4	78.7
Carrying Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	53,593.1	53,314.1
Carrying Value \| Funding agreements with fixed maturities and guaranteed investment contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	175.2	472.9
Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	3,878.6	3,878.9
Carrying Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	2,097.1	2,029.6
Carrying Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	107.4	81.0
Carrying Value \| GMAB/GMWB/GMWBL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,465.8	1,530.4
Carrying Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	141.2	150.4
Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	12,689.7	11,725.2
Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,906.0	1,961.5
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	76,037.8	75,338.1
Equity securities, available-for-sale	304.0	274.2
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement	4,057.5	4,520.1
Derivatives	1,396.6	1,712.4
Other investments	62.2	57.2
Assets held in separate accounts	102,990.8	97,118.7
Short-term debt	742.2	0.0
Long-term debt	3,031.3	3,737.9
Fair Value \| Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	408.1	470.7
Fair Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	113.4	78.7
Fair Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	58,598.1	57,561.3
Fair Value \| Funding agreements with fixed maturities and guaranteed investment contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	172.1	469.8
Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	4,176.7	4,120.5
Fair Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	2,097.1	2,029.6
Fair Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	107.4	81.0
Fair Value \| GMAB/GMWB/GMWBL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,465.8	1,530.4
Fair Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	141.2	150.4
Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	12,893.7	11,960.7
Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 1,906.0	$ 1,961.5

Amount of debt securities categorized neither as held-to-maturity nor trading.

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