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Borrowings - Cabot Securitisation Senior Facility (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021	Jun. 30, 2022 USD ($)	Jun. 30, 2021	Jun. 30, 2022 GBP (£)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Book value	$ 4,459,484		$ 4,459,484			$ 4,608,125
United Kingdom, Pounds
Debt Instrument [Line Items]
Foreign currency exchange rate, translation	0.82		0.82		0.82
Cabot securitisation senior facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 426,100		$ 426,100		£ 350,000,000
Book value	$ 443,200		$ 443,200		£ 364,100,000
Weighted average interest rate (as a percent)	3.95%	3.11%	3.70%	3.11%
Cabot securitisation senior facility \| Sterling Overnight Index Average (SONIA) \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			3.00%
Cabot securitisation senior facility \| Minimum \| Sterling Overnight Index Average (SONIA) \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			0.00%
Cabot securitisation senior facility \| Maximum \| Sterling Overnight Index Average (SONIA) \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.00%