Income Taxes - Temporary Differences (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Insurance reserves	$ 166.7	$ 255.4
Investments	231.8	87.5
Postemployment benefits	67.3	50.6
Compensation and benefits	35.8	44.4
Other assets	0	24.5
Total gross assets before valuation allowance	501.6	462.4
Valuation allowance, deferred tax assets	11.1	11.1
Assets, net of valuation allowance	490.5	451.3
Net unrealized investment (gains) losses	(310.5)	(482.4)
Deferred policy acquisition costs	(124.1)	(143.8)
Value of business acquired	(243.8)	(332.2)
Other liabilities	(2.2)	0
Total gross liabilities	680.6	958.4
Net deferred income tax asset (liability)	$ (190.1)	$ (507.1)

Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation and Employee Benefits

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Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postemployment Benefits

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Deferred Tax Liabilities, Deferred Expense, Value of Business Acquired

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from estimated policyholder reserves, which will be deductible from future taxable income when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the tax deduction to be taken.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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The amount as of the balance sheet date of the estimated future tax effects attributable to policy acquisition costs being expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, which will reverse in future periods when amortization of such capitalized costs cannot be deducted for tax purposes.

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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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