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Unpaid Loss and Loss Adjustment Expense - Cumulative paid loss and ALAE, net of reinsurance (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Claims Development [Line Items] |  |  |  |
Total paid losses and ALAE, net | $ 51.5 |  |  |
Total unpaid loss and ALAE reserves, net | 9.7 |  |  |
Ceded unpaid loss and LAE | 18.5 |  |  |
Gross unpaid loss and LAE | 28.2 |  |  |
2016 |  |  |  |
Claims Development [Line Items] |  |  |  |
Total paid losses and ALAE, net | 0.0 | $ 0.0 | $ 0.0 | $ 0.0
2016 | Maximum |  |  |  |
Claims Development [Line Items] |  |  |  |
Total paid losses and ALAE, net | 0.1 | 0.1 | 0.1 | $ 0.1
2017 |  |  |  |
Claims Development [Line Items] |  |  |  |
Total paid losses and ALAE, net | 1.7 | 1.7 | 1.6 |
2018 |  |  |  |
Claims Development [Line Items] |  |  |  |
Total paid losses and ALAE, net | 13.4 | $ 13.2 | $ 0.0 |
2019 |  |  |  |
Claims Development [Line Items] |  |  |  |
Total paid losses and ALAE, net | $ 36.4 |  |  |

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- Definition Undiscounted amount, after reinsurance, of the liability for ceded unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References No definition available. + Details
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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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