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Summary Of Accounting Policies And Accounting Changes (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2018
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses |  | $ 472.5 | $ 440.1 | $ 447.4 | $ 477.4 | $ 418.3 | $ 490.2 | $ 436.1 | $ 436.2 | $ 1,837.4 | $ 1,780.8 | $ 1,467.6 |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  | 111.6 |  |  |  | 106.4 |  |  |  | 111.6 | 106.4 |  |
Accrued Investment Income Receivable |  | 72.8 |  |  |  | 70.8 |  |  |  | 72.8 | 70.8 |  |
Write-off of long-lived asset |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | $ 11.1 |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Costs |  | 365.3 |  |  |  | 332.0 |  |  |  | 365.3 | 332.0 |  |
Life Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Present value of the future profits embedded in life insurance in force |  | 25.5 |  |  |  | 28.9 |  |  |  | 25.5 | 28.9 |  |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  |  | 3.0 |  |  |
2019 |  |  |  |  |  |  |  |  |  | 2.8 |  |  |
2020 |  |  |  |  |  |  |  |  |  | 2.3 |  |  |
2021 |  |  |  |  |  |  |  |  |  | 2.0 |  |  |
2022 |  |  |  |  |  |  |  |  |  | 1.9 |  |  |
Property and Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Present value of the future profits embedded in life insurance in force |  | 7.3 |  |  |  | 9.0 |  |  |  | 7.3 | 9.0 |  |
Broker Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired |  | $ 15.6 |  |  |  | 16.8 |  |  |  | $ 15.6 | 16.8 |  |
Useful life of intangibles acquired (in years) |  |  |  |  |  |  |  |  |  | 15 years |  |  |
Minimum [Member] | Traditional Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Interest Rate |  | 3.00% |  |  |  |  |  |  |  | 3.00% |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Expense |  |  |  |  |  |  |  |  |  |  | (2.7) |  |
Change in Accounting Estimate, Use of Death Master File in Reserving Process [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  |  | $ 77.8 |  |  |
Premium Deficiency [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Costs |  | $ (1.2) |  |  |  | $ (9.7) |  |  |  | $ (1.2) | $ (9.7) |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Amortization Expense of Ending Present Value of Future Insurance Profits, Net of Interest Accrued [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 0.5 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 17.7

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