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Secured Debt Arrangements, Net - Additional Information (Details) € in Millions, £ in Millions	1 Months Ended				12 Months Ended
	Nov. 30, 2019 USD ($) extension subsidiary	Jul. 31, 2018	Jun. 30, 2018	Nov. 30, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 GBP (£)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Borrowings Outstanding					$ 3,078,366,000					$ 1,879,522,000
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing under facility					4,330,744,000					3,124,725,000
Securities sold under agreements to repurchase, gross					3,095,556,000
Borrowings Outstanding					3,078,366,000					1,879,522,000
Line of Credit | JP Morgan Facility
Debt Instrument [Line Items]
Securities sold under agreements to repurchase, gross					$ 1,234,759,000
Line of Credit | Deutsche Bank Repurchase Facility
Debt Instrument [Line Items]
Maximum borrowing under facility								$ 1,250,000,000
Extension option					1 year
Securities sold under agreements to repurchase, gross					$ 513,876,000
Borrowings Outstanding					513,900,000
Line of Credit | Goldman Facility
Debt Instrument [Line Items]
Maximum borrowing under facility				$ 300,000,000.0					$ 500,000,000.0
Extension option				1 year
Securities sold under agreements to repurchase, gross					322,170,000
Borrowings Outstanding					322,200,000
Line of Credit | Barclays Facility
Debt Instrument [Line Items]
Borrowings Outstanding					472,900,000
Amended and Restated JPMorgan Facility | Line of Credit | JP Morgan Facility
Debt Instrument [Line Items]
Number of subsidiaries | subsidiary	3
Maximum borrowing under facility	$ 1,300,000,000
Debt instrument, number of extensions available | extension	2
Extension option	1 year
Securities sold under agreements to repurchase, gross					1,200,000,000	€ 84.0	£ 38.0
USD | Line of Credit | JP Morgan Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					1,154,109,000					1,333,503,000
Borrowings Outstanding					1,090,160,000					680,141,000
USD | Line of Credit | Deutsche Bank Repurchase Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					1,250,000,000					904,181,000
Borrowings Outstanding					513,876,000					419,823,000
USD | Line of Credit | Goldman Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					500,000,000					300,000,000
Borrowings Outstanding					322,170,000					210,072,000
USD | Line of Credit | Credit Suisse Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					226,068,000					187,117,000
Securities sold under agreements to repurchase, gross					218,644,000
Borrowings Outstanding					218,644,000					187,117,000
Term after either party notifies the other party of intention to terminate		6 months
USD | Line of Credit | HSBC Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					50,625,000
Securities sold under agreements to repurchase, gross					50,625,000
Borrowings Outstanding					50,625,000
GBP | Line of Credit | JP Morgan Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					51,702,000					48,497,000
Borrowings Outstanding					50,410,000					48,497,000
GBP | Line of Credit | Deutsche Bank Repurchase Facility
Debt Instrument [Line Items]
Maximum borrowing under facility										150,819,000
Borrowings Outstanding										150,819,000
GBP | Line of Credit | Credit Suisse Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					93,915,000					151,773,000
Securities sold under agreements to repurchase, gross					93,915,000
Borrowings Outstanding					93,900,000		70.8			151,773,000
Term after either party notifies the other party of intention to terminate			6 months
GBP | Line of Credit | HSBC Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					34,634,000					48,835,000
Securities sold under agreements to repurchase, gross					34,634,000
Borrowings Outstanding					34,634,000		26.1			$ 48,835,000
GBP | Line of Credit | Barclays Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					538,916,000
Securities sold under agreements to repurchase, gross					290,347,000
Borrowings Outstanding					290,347,000		£ 219.0
EUR | Line of Credit | JP Morgan Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					94,189,000
Borrowings Outstanding					94,189,000
EUR | Line of Credit | HSBC Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					154,037,000
Securities sold under agreements to repurchase, gross					154,037,000
Borrowings Outstanding					154,037,000	€ 137.4
EUR | Line of Credit | Barclays Facility
Debt Instrument [Line Items]
Maximum borrowing under facility					182,549,000
Securities sold under agreements to repurchase, gross					182,549,000
Borrowings Outstanding					$ 182,549,000

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