Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Statement of Cash Flows [Abstract]
Net cash provided by (used in) operating activities	$ 786.6	$ (28.4)
Proceeds from the sale, maturity, disposal or redemption of:
Fixed maturities	2,629.7	4,455.8
Equity securities, available-for-sale	47.7	28.4
Mortgage loans on real estate	307.4	318.3
Limited partnerships/corporations	60.9	18.0
Acquisition of:
Fixed maturities	(3,057.2)	(4,802.8)
Equity securities, available-for-sale	(7.4)	(9.4)
Mortgage loans on real estate	(252.9)	(581.4)
Limited partnerships/corporations	(18.4)	(9.8)
Short-term investments, net	1.9	2,999.1
Policy loans, net	27.3	(4.1)
Derivatives, net	(178.6)	(1,089.6)
Other investments, net	2.0	11.8
Sales from consolidated investment entities	571.8	573.8
Purchases within consolidated investment entities	(1,258.8)	(613.8)
Collateral received (delivered), net	89.4	(360.5)
Purchases of fixed assets, net	(8.7)	(6.6)
Net cash (used in) provided by investing activities	(1,043.9)	927.2
Cash Flows from Financing Activities:
Deposits received for investment contracts	2,500.0	2,936.2
Maturities and withdrawals from investment contracts	(2,809.7)	(2,996.6)
Proceeds from issuance of debt with maturities of more than three months	0	1,000.6
Repayment of debt with maturities of more than three months	0	(1,304.6)
Short-term debt, net	0	(169.7)
Debt issuance costs	(16.7)	(6.5)
Borrowings of consolidated investment entities	28.4	0
Contributions from (distributions to) participants in consolidated investment entities	466.9	642.7
Common stock acquired - Share buyback	(250.0)	0
Dividends paid	(2.6)	0
Net cash (used in) provided by financing activities	(83.7)	102.1
Net (decrease) increase in cash and cash equivalents	(341.0)	1,000.9
Cash and cash equivalents, beginning of year	2,840.8	1,786.8
Cash and cash equivalents, end of year	2,499.8	2,787.7
Supplemental cash flow information:
Income taxes paid (received), net	31.0	(3.2)
Interest paid	$ 67.2	$ 55.1

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Payments for (Proceeds from) Other Investments

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The cash inflow from a segregated fund account during the period.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

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Net amount paid or received by the entity associated with issuance or collection of loans made to policy holders, principally secured by the benefits under the policy.

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The cash outflow to reacquire common stock during the period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities.

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The cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities.

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The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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The cash outflow from the purchase of receivables arising from the mortgage note on real estate.

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No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebtMaturingInMoreThanThreeMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for a segregated fund account during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

Name:	us-gaap_WithdrawalFromContractHoldersFunds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration