Significant Accounting Policies (Narrative) (Details) - Accounting Standards Update 2016-13 $ in Millions	Jan. 01, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, effect of adoption, quantification	$ 8.6
Reinsurance Recoverable, Allowance for Credit Loss
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, effect of adoption, quantification	3.2
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, effect of adoption, quantification	$ (9.3)