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Summary Of Accounting Policies And Accounting Changes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Jan. 01, 2018
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses | $ 772.8 | $ 757.3 | $ 499.5 | $ 436.9 | $ 472.5 | $ 440.1 | $ 447.4 | $ 477.4 | $ 2,466.5 | $ 1,837.4 | $ 1,780.8 |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 158.3 |  |  |  | 111.6 |  |  |  | 158.3 | 111.6 |  |  |
Accrued Investment Income Receivable | 77.9 |  |  |  | 72.8 |  |  |  | 77.9 | 72.8 |  |  |
Present Value of Future Insurance Profits, Amortization Expense, Next Five Years [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Definite Lived Intangible Assets: | 261.0 |  |  |  | 133.2 |  |  |  | 261.0 | 133.2 |  |  |
Deferred Policy Acquisition Costs | 470.0 |  |  |  | 365.3 |  |  |  | 470.0 | 365.3 |  |  |
Life Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Present Value of Future Insurance Profits, Amortization Expense, Next Five Years [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 6.3 |  |  |  |  |  |  |  | 6.3 |  |  |  |
2019 | 4.0 |  |  |  |  |  |  |  | 4.0 |  |  |  |
2020 | 2.8 |  |  |  |  |  |  |  | 2.8 |  |  |  |
2021 | 2.2 |  |  |  |  |  |  |  | 2.2 |  |  |  |
2022 | 1.8 |  |  |  |  |  |  |  | 1.8 |  |  |  |
Value of Business Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Present value of the future profits embedded in life insurance in force | $ 30.2 |  |  |  | $ 26.0 |  |  |  | $ 30.2 | $ 26.0 |  |  |
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 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 |  |
AOCI Including Portion Attributable to Noncontrolling Interest [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)
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
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Present Value of Future Insurance Profits, Amortization Expense, Next Five Years [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  | $ 85.0 |

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