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Borrowings - Long-term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Borrowings, carrying amount	$ 0	$ 4,415,016,000
Senior Notes
Debt Instrument [Line Items]
Borrowings, carrying amount	223,086,000	124,037,000
Senior Subordinated Notes
Debt Instrument [Line Items]
Borrowings, carrying amount	181,673,000	181,394,000
Maturing August 2031 | Senior Notes
Debt Instrument [Line Items]
Borrowings, carrying amount	$ 98,642,000	0
Face amount, percentage	2.875%
Issue of subordinated term note	$ 100,000,000
Senior unsecured notes aggregate amount	$ 100,000,000
Redemption price, percent of principal balance	100.00%
Maturing September 2024 | Senior Notes
Debt Instrument [Line Items]
Borrowings, carrying amount	$ 24,672,000	24,552,000
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	$ 99,772,000	99,485,000
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	$ 72,403,000	72,222,000
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	$ 109,270,000	$ 109,172,000
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%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maturing August 2031 | Senior Notes
Debt Instrument [Line Items]
Spread on variable interest rate	2.35%
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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