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Reinsurance -Unsecured reinsurance recoverable (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable | $ 42.2 | $ 20.3 | $ 11.8
Unsecured recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | 14.5 | 9.4
Reinsurers Rated Under AM Best Credit Rating [Member] | Unsecured recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | 10.0 | 6.7
Hannover Rueck SE | Unsecured recoverable | A+ |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | 2.3 | 1.5
Munich Reinsurance America Inc | Unsecured recoverable | A+ |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | 1.7 | 1.1
Lloyd's Underwriter Syndicate no. 0033 HIS | Unsecured recoverable | A |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | 1.7 | 1.1
Lloyd's Underwriter Syndicate no. 2357 NCL | Unsecured recoverable | A |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | 1.7 | 1.1
Hiscox Insurance Company (Bermuda) Ltd | Unsecured recoverable | A |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | 1.3 | 1.0
Lloyd's Underwriter Syndicate no. 2001 AML | Unsecured recoverable | NR |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | 1.3 | 0.9
Other reinsurers | Unsecured recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Total reinsurance recoverable |  | $ 4.5 | $ 2.7

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195 + Details
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