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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Derivative [Line Items]
Unrealized gains, before tax	$ 52,985,000	$ (39,096,000)	$ (22,345,000)	$ (102,218,000)
Pre-tax income (loss)	(4,900,000)	(6,200,000)	(15,800,000)	(17,700,000)
Cash flow hedge loss to be reclassified			55,000,000
Cash flow hedge termination loss			19,000,000
Reclaim cash collateral	50,600,000		50,600,000		$ 69,700,000
Obligation to return cash collateral	4,600,000		4,600,000		$ 5,700,000
Cash Flow Hedges
Derivative [Line Items]
Unrealized gains, before tax	0	$ 0	$ 0	$ 0
Fair Value Hedges | Interest Rate Contract
Derivative [Line Items]
Carrying value of long-term debt	$ 198,400,000

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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