Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Derivative [Line Items]
Unrealized gains, before tax	$ (18,274,000)	$ (73,123,000)	$ (75,330,000)	$ (63,123,000)
Unrealized gain, after tax	(13,861,000)	(55,325,000)	(57,138,000)	(47,759,000)
Pre-tax income (loss)	(5,300,000)	(6,100,000)	(10,900,000)	(11,500,000)
Cash flow hedge loss to be reclassified			106,000,000
Cash flow hedge termination loss			19,000,000
Reclaim cash collateral	44,600,000		44,600,000		$ 69,700,000
Obligation to return cash collateral	5,700,000		5,700,000		$ 5,700,000
Cash Flow Hedges
Derivative [Line Items]
Unrealized gains, before tax			$ 0	$ 0
Unrealized gain, after tax	$ 0	$ 0