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Credit Losses (Tables) | 12 Months Ended
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Dec. 31, 2020
Credit Loss [Abstract] |
Reinsurance Recoverable, Allowance for Credit Loss | The following table summarizes the Company’s allowance for expected credit losses for the twelve months ended December 31, 2020 in investments, reinsurance recoverables and receivables following the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326)”:
|  | Twelve Months Ended December 31, 2020
|  | ($ in millions)
|  | Investments |  | Reinsurance Recoverables |  | Receivables |  |
Opening value as at January 1, 2020 |  | $ | 0.6 |  |  | $ | 3.7 |  |  | $ | 23.0 |  |  |
Movement of the allowance for credit losses during the year |  | (0.4) |  |  | 0.1 |  |  | 11.0 |  |  |
Closing value as at December 31, 2020 |  | $ | 0.2 |  |  | $ | 3.8 |  |  | $ | 34.0 |  |  |

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- Definition Tabular disclosure of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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