Fair Value Measurements - Other Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, available-for-sale	$ 84.4	$ 131.3
Derivative assets	594.9	450.3
Assets held in separate accounts	61,647.2	58,910.6
Derivatives liabilities	235.7	115.1
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	25,513.3	22,258.8
Equity securities, available-for-sale	84.4	131.3
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement	848.3	902.6
Derivative assets	594.9	450.3
Notes receivable from affiliates	175.0	175.0
Assets held in separate accounts	61,647.2	58,910.6
Deposit liabilities	188.0	194.8
Derivatives liabilities	235.7	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	1.5	(71.6)
Carrying Value \| Funding agreements without fixed maturities and deferred annuities(1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	24,398.4	22,979.4
Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	394.7	411.8
Carrying Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	21.8	23.1
Carrying Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	267.1	161.3
Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,109.3	3,729.1
Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	221.8	229.8
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	25,513.3	22,258.8
Equity securities, available-for-sale	84.4	131.3
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement	848.3	902.5
Derivative assets	594.9	450.3
Notes receivable from affiliates	228.9	208.4
Assets held in separate accounts	61,647.2	58,910.6
Deposit liabilities	268.0	194.8
Derivatives liabilities	235.7	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	1.5	(71.6)
Fair Value \| Funding agreements without fixed maturities and deferred annuities(1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	29,570.7	27,612.3
Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	481.5	479.2
Fair Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	21.8	23.1
Fair Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	267.1	161.3
Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,262.1	3,881.1
Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 221.8	$ 229.8

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

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Amount of equity securities categorized neither as held-to-maturity nor as 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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Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

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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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The fair value of the assets held by the Entity for the benefit of separate account policyholders.

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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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