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Summary Of Accounting Policies And Accounting Changes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | $ 106.4 |  |  |  | $ 108.3 |  |  |  | $ 106.4 | $ 108.3 |
Accrued Investment Income Receivable | 70.8 |  |  |  | 68.5 |  |  |  | 70.8 | 68.5 |
Deferred Policy Acquisition Costs | 332.0 |  |  |  | 316.4 |  |  |  | 332.0 | 316.4 |
Write-off of long-lived asset |  |  |  |  | 0.0 | $ 0.0 | $ 11.1 | $ 0.0 | 0.0 | 11.1 | $ 54.6
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses | 418.3 | $ 490.2 | $ 436.1 | $ 436.2 | 416.0 | $ 378.8 | $ 375.1 | $ 297.7 | 1,780.8 | 1,467.6 | $ 1,261.7
Life Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Present value of the future profits embedded in life insurance in force | 28.9 |  |  |  | 32.5 |  |  |  | 28.9 | 32.5 |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  | 3.1 |  |
2018 |  |  |  |  |  |  |  |  | 2.8 |  |
2019 |  |  |  |  |  |  |  |  | 2.4 |  |
2020 |  |  |  |  |  |  |  |  | 2.0 |  |
2021 |  |  |  |  |  |  |  |  | 1.8 |  |
Property and Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Present value of the future profits embedded in life insurance in force | 9.0 |  |  |  | 11.2 |  |  |  | 9.0 | 11.2 |
Broker Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets acquired | $ 16.8 |  |  |  | 18.1 |  |  |  | $ 16.8 | 18.1 |
Useful life of intangibles acquired (in years) |  |  |  |  |  |  |  |  | 15 years |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of intangibles acquired (in years) |  |  |  |  |  |  |  |  | 2 years |  |
Minimum [Member] | Traditional Life [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Interest Rate | 3.00% |  |  |  |  |  |  |  | 3.00% |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of intangibles acquired (in years) |  |  |  |  |  |  |  |  | 5 years |  |
Maximum [Member] | Traditional Life [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Interest Rate | 7.00% |  |  |  |  |  |  |  | 7.00% |  |
Change in Accounting Method Accounted for as Change in Estimate [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension Expense |  |  |  |  |  |  |  |  | $ (2.7) |  |
Change in Accounting Estimate, Use of Death Master File in Reserving Process [Member] |  |  |  |  |  |  |  |  |  |  |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | 77.8 |  |
Premium Deficiency [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Costs | $ (9.7) |  |  |  | $ (9.0) |  |  |  | $ (9.7) | $ (9.0) |

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