Fair Value Measurements - Other Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 22,788.9	$ 22,140.9
Derivative assets	659.0	450.3
Short-term loan to affiliate	12.0	0.0
Derivatives liabilities	275.4	115.1
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement	1,317.6	902.6
Derivative assets	659.0	450.3
Notes receivable from affiliates	175.0	175.0
Short-term loan to affiliate	12.0	0.0
Assets held in separate accounts	59,113.1	58,910.6
Deposit liabilities	194.1	194.8
Derivatives liabilities	275.4	115.1
Long-term debt, fair value	4.9	4.9
Carrying Value \| Reinsurance agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Embedded derivative on reinsurance	(32.3)	(71.6)
Carrying Value \| Funding agreements without fixed maturities and deferred annuities(1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	23,366.2	22,979.4
Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	408.3	411.8
Carrying Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	21.7	23.1
Carrying Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	226.0	161.3
Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,930.0	3,729.1
Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	225.2	229.8
Carrying Value \| Fixed maturities, available-for-sale, including securities pledged
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	23,406.5	22,258.8
Carrying Value \| Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	82.9	131.3
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement	1,317.6	902.5
Derivative assets	659.0	450.3
Notes receivable from affiliates	213.0	208.4
Short-term loan to affiliate	12.0	0.0
Assets held in separate accounts	59,113.1	58,910.6
Deposit liabilities	319.5	194.8
Derivatives liabilities	275.4	115.1
Long-term debt, fair value	4.9	4.9
Fair Value \| Reinsurance agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Embedded derivative on reinsurance	(32.3)	(71.6)
Fair Value \| Funding agreements without fixed maturities and deferred annuities(1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	28,203.6	27,612.3
Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	483.2	479.2
Fair Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	21.7	23.1
Fair Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	226.0	161.3
Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,086.0	3,881.1
Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	225.2	229.8
Fair Value \| Fixed maturities, available-for-sale, including securities pledged
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	23,406.5	22,258.8
Fair Value \| Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 82.9	$ 131.3

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

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Carrying amount of liabilities as of the balance sheet date pertaining to amounts received by the insurer or reinsurer from the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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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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