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Reinsurance (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | $ 2,900.0 | $ 2,800.0
Allowance for reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Valuation allowances and reserves balance | $ 10.2 | $ 7.3
Customer Concentration Risk, Customer One | Reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 15.80% | 12.70%
Customer Concentration Risk, Customer One | Allowance for reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 16.00% | 18.10%
Customer Concentration Risk, Customer Two | Reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 9.80% | 7.20%
Customer Concentration Risk, Customer Two | Allowance for reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 7.40% | 7.90%
Customer Concentration Risk, Customer Three | Reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 6.90% | 7.00%
Customer Concentration Risk, Customer Three | Allowance for reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 5.70% | 7.20%
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 49.50% | 57.50%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 49.30% | 41.00%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 1.20% | 1.50%

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