TWO Quarterly report [Sections 13 or 15(d)]

Derivative Instruments and Hedging Activities - Futures (Details) - Futures, net - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Notional	$ (6,354,300,000)	$ (4,357,800,000)
Carrying Value	$ 0	$ 0
Weighted Average Months to Expiration	2 years 3 months 14 days	2 years 11 months 30 days
U.S. Treasury Futures \| 2 Years
Derivative [Line Items]
Notional	$ (2,312,800,000)	$ (1,448,000,000)
Carrying Value	$ 0	$ 0
Weighted Average Months to Expiration	2 months 30 days	2 months 29 days
U.S. Treasury Futures \| 5 Year
Derivative [Line Items]
Notional	$ (1,701,200,000)	$ (1,047,400,000)
Carrying Value	$ 0	$ 0
Weighted Average Months to Expiration	2 months 30 days	2 months 29 days
U.S. Treasury Futures \| 10 Year
Derivative [Line Items]
Notional	$ (501,100,000)	$ (115,700,000)
Carrying Value	$ 0	$ 0
Weighted Average Months to Expiration	2 months 18 days	2 months 18 days
U.S. Treasury Futures \| 20 Year
Derivative [Line Items]
Notional	$ (190,800,000)	$ (283,300,000)
Carrying Value	$ 0	$ 0
Weighted Average Months to Expiration	2 months 18 days	2 months 18 days
Eris SOFR Swap Futures \| 5 Year
Derivative [Line Items]
Notional	$ (1,200,000,000)	$ (1,200,000,000)
Carrying Value	$ 0	$ 0
Weighted Average Months to Expiration	5 years 2 months 18 days	5 years 2 months 17 days
Eris SOFR Swap Futures \| 10 Year
Derivative [Line Items]
Notional	$ (830,000,000)	$ (830,000,000)
Carrying Value	$ 0	$ 0
Weighted Average Months to Expiration	10 years 2 months 20 days	10 years 2 months 19 days