Debt - Narrative (Details) - USD ($)			12 Months Ended
	Sep. 26, 2025	Sep. 15, 2023	Dec. 31, 2025	Dec. 31, 2021	Oct. 14, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Outstanding debt			$ 593,400,000			$ 547,000,000.0
Purchase of FHLB activity-based common stock as percentage of borrowing, percentage, authorized			15.00%	25.00%
Senior Notes | 2030 Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 300,000,000.0		$ 300,000,000.0			300,000,000.0
Stated rate	4.70%		4.70%
Effective yield	4.82%
Debt redemption price percentage	100.00%
Debt redemption price, interest discounted at treasury yield margin	0.20%
Outstanding debt			$ 295,400,000			0
Senior Notes | 2015 Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 250,000,000.0			$ 250,000,000.0
Stated rate			4.50%		4.50%	4.50%
Repayment of debt					$ 250,000,000.0
Accrued and unpaid interest					$ 4,200,000
Outstanding debt			$ 0			$ 249,700,000
Senior Notes | 2023 Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 300,000,000.0
Stated rate		7.25%	7.25%
Effective yield		7.29%
Debt redemption price percentage	100.00%
Debt redemption price, interest discounted at treasury yield margin		0.45%
Outstanding debt			$ 298,000,000.0			297,300,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.15%
Available borrowing capacity			$ 325,000,000.0
Commitment fee percent			0.15%
Outstanding debt			$ 0			$ 0