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Borrowings - Long-term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Borrowings, carrying amount | $ 4,415,016,000 | $ 350,000,000
Senior Notes |  |
Debt Instrument [Line Items] |  |
Borrowings, carrying amount | 124,037,000 | 123,630,000
Senior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Borrowings, carrying amount | 181,394,000 | 181,115,000
Maturing September 2024 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Borrowings, carrying amount | $ 24,552,000 | 24,432,000
Face amount, percentage | 4.50% |
Issue of subordinated term note | $ 25,000,000 |
Senior unsecured notes aggregate amount | $ 25,000,000 |
Redemption price, percent of principal balance | 100.00% |
Maturing June 2022 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Borrowings, carrying amount | $ 99,485,000 | 99,198,000
Face amount, percentage | 3.95% |
Issue of subordinated term note | $ 100,000,000 |
Senior unsecured notes aggregate amount | $ 100,000,000 |
Redemption price, percent of principal balance | 99.775% |
Maturing December 2034 | Senior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Borrowings, carrying amount | $ 72,222,000 | 72,040,000
Face amount, percentage | 5.375% |
Issue of subordinated term note | $ 74,750,000 |
Senior unsecured notes aggregate amount | $ 74,750,000 |
Redemption price, percent of principal balance | 100.00% |
Maturing June 2029 | Senior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Borrowings, carrying amount | $ 109,172,000 | $ 109,075,000
Face amount, percentage | 6.125% |
Issue of subordinated term note | $ 110,000,000 |
Senior unsecured notes aggregate amount | $ 110,000,000 |
Redemption price, percent of principal balance | 100.00% |
London Interbank Offered Rate (LIBOR) | Maturing June 2029 | Senior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Spread on variable interest rate | 3.443% |

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