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v3.20.4

Notes Payable - Additional Information (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 01, 2019 USD ($) | Dec. 31, 2020 | Aug. 01, 2019 GBP (£) | Mar. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Minimum Repayment of Aggregate Principal Amount of Senior Notes (as a percent) |  | 5.00% |  |
Outstanding Principal Amount of Senior Notes (as a percent) |  | 100.00% |  |
Parent Company [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  |  |  | $ 170,000,000
Long-term Debt, Weighted Average Life | 12 years |  |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time (as a percent) | 4.26% |  | 4.26% |
Parent Company [Member] | Senior Notes [Member] | United States of America, Dollars |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | $ 175,000,000 |  |  |
Parent Company [Member] | Senior Notes [Member] | United Kingdom, Pounds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | £ |  |  | £ 25,000,000 |
Parent Company [Member] | Series A Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  |  |  | $ 38,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.88%
Parent Company [Member] | Series B Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  |  |  | $ 67,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.23%
Parent Company [Member] | Series C Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  |  |  | $ 48,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.48%
Parent Company [Member] | Series D Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  |  |  | $ 17,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.58%
Parent Company [Member] | Series E Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | $ 75,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.34% |  | 4.34% |
Parent Company [Member] | Series F Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | $ 60,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.44% |  | 4.44% |
Parent Company [Member] | Series G Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | $ 40,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.54% |  | 4.54% |
Parent Company [Member] | Series H Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | £ |  |  | £ 25,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.33% |  | 3.33% |

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