Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Weighted average interest rate of long-term debt outstanding calculated over time.

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Borrowings - Cabot Securitisation Senior Facility - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 GBP (£)
Debt Instrument [Line Items]
Book value \| $	$ 4,864,523	$ 4,909,950
Cabot securitisation senior facility
Debt Instrument [Line Items]
Maximum borrowing capacity \| £			£ 350,000,000.0
Credit facility, outstanding amount	478,100		350,000,000.0
Book value	$ 543,300		£ 397,700,000
Weighted average interest rate (as a percent)	3.23%	3.74%
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%