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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements | 100.00% |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Other Asset Impairment Charges | $ 4.7 | $ 24.5 | $ 0.6
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 97.0 | 79.4 |
Property, Plant and Equipment, Gross | 248.7 | 236.1 |
Depreciation | 18.3 | 17.2 | 16.6
Goodwill | 7.0 | 7.0 |
Present Value of Future Insurance Profits, Net | 5.1 | 3.3 |
Present Value of Future Insurance Profits, Accumulated Amortization | 15.0 | 14.6 |
Amortization of Value of Business Acquired (VOBA) | 0.4 | 0.3 | 0.5
Values Of Business Acquired Distribution Agreements And Customer Relationships | 40.8 | 49.2 |
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships | 79.8 | 71.5 |
Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships | 8.3 | 8.7 | 9.0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 8.1 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 7.6 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 6.6 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 6.4 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 6.2 |  |
Capitalized Computer Software, Net | 150.4 | 145.5 |
Capitalized Computer Software, Amortization | $ 26.9 | $ 35.7 | $ 10.3
Value of Customer Relationships Acquired [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |
Value of Distribution Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |

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- Definition The adjustment that represents the periodic charge against earnings to reduce the business acquired distribution agreements and customer relationships (VODA and VOCRA) over the expected life of the underlying insurance contracts. + References No definition available. + Details
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