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Statutory Requirements and Dividends Restrictions - Additional Information (Details) - 12 months ended Dec. 31, 2019 £ in Millions, $ in Millions | USD ($) | GBP (£)
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AUL |  |
Statutory Accounting Practices [Line Items] |  |
Syndicate to maintain funds at Lloyd | $ 491.9 |
Total funds held by AUL | 516.9 |
U.K. |  |
Statutory Accounting Practices [Line Items] |  |
Dividend payment made without regulatory approval | (243.0) | £ (84.8)
Capital contributions reserves | 470.0 |
Bermuda |  |
Statutory Accounting Practices [Line Items] |  |
Dividend payment made without regulatory approval | $ (345.2) |
Statutory capital and surplus, percent | 25.00% |
Statutory capital and surplus, percent reduction requiring approval | 15.00% |
Percent warning level of amount of enhanced capital required from statutory capital and surplus | 120.00% |
Bermuda | AUL |  |
Statutory Accounting Practices [Line Items] |  |
Total funds held by AUL | $ 482.3 |

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- Definition Dividend Payments Restrictions Schedule, Statutory Capital and Surplus, Percent + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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