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Borrowings - Cabot Securitisation Senior Facility (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020	Jun. 30, 2021 USD ($)	Jun. 30, 2020	Jun. 30, 2021 GBP (£)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Book value	$ 4,679,752		$ 4,679,752			$ 4,864,523
Cabot securitisation senior facility
Debt Instrument [Line Items]
Maximum borrowing capacity	484,100		484,100		£ 350,000,000.0
Book value	$ 506,300		$ 506,300		£ 366,100,000
Weighted average interest rate (as a percent)	3.11%	3.14%	3.11%	3.33%
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)			3.06%
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%