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Unpaid Loss and Loss Adjustment Expense - Incurred loss and allocated loss adjustment expense ("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 incurred losses and allocated loss adjustment expenses, net | $ 61.2 |  |  |
IBNR | $ 3.9 |  |  |
Cumulative Number of Reported Claims | 30,652.0 |  |  |
2016 |  |  |  |
Claims Development [Line Items] |  |  |  |
Total incurred losses and allocated loss adjustment expenses, net | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
IBNR | $ 0.0 |  |  |
Cumulative Number of Reported Claims | 8.0 |  |  |
2016 | Maximum |  |  |  |
Claims Development [Line Items] |  |  |  |
Total incurred losses and allocated loss adjustment expenses, net | $ 0.1 | 0.1 | 0.1 | 0.1
2017 |  |  |  |
Claims Development [Line Items] |  |  |  |
Total incurred losses and allocated loss adjustment expenses, net | 1.7 | 1.7 | 1.7 | 0.0
IBNR | $ 0.0 |  |  |
Cumulative Number of Reported Claims | 1,758.0 |  |  |
2018 |  |  |  |
Claims Development [Line Items] |  |  |  |
Total incurred losses and allocated loss adjustment expenses, net | $ 13.5 | 15.0 | 0.0 | 0.0
IBNR | $ 0.1 |  |  |
Cumulative Number of Reported Claims | 10,522.0 |  |  |
2019 |  |  |  |
Claims Development [Line Items] |  |  |  |
Total incurred losses and allocated loss adjustment expenses, net | $ 46.0 | $ 0.0 | 0.0 | 0.0
IBNR | $ 3.8 |  |  |
Cumulative Number of Reported Claims | 18,364.0 |  |  |
2019 | Maximum |  |  |  |
Claims Development [Line Items] |  |  |  |
IBNR |  |  | $ 0.1 | $ 0.1

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- Definition Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense 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 4E -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671321-158438 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671317-158438 + Details
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- Definition Undiscounted amount, after reinsurance, of incurred 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 (a) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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- Definition Cumulative number of reported claims for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671317-158438 + Details
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