Borrowings - Global Senior Secured Revolving Credit Facility - Narrative (Details)	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2019
Global senior secured revolving credit facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility	$ 1,050,000,000.0
Maximum ratio of financial indebtedness to cash and cash equivalent investments	0.75
Utilization threshold (as a percent)	20.00%
Maximum ratio of super senior liabilities to cash and cash equivalent investments	0.275
Fixed charge coverage ratio	2.0
Long-term debt	$ 481,000,000.0
Remaining borrowing capacity	$ 569,000,000.0
Weighted average interest rate (as a percent)	3.25%
Cabot Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	3.30%	3.52%
Encore revolving credit facility
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	3.90%	5.27%
LIBOR \| Global senior secured revolving credit facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.50%
Floor interest rate	0.75%
Euro Interbank Offered Rate (EURIBOR) \| Global senior secured revolving credit facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.50%
Floor interest rate	0.75%

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Line Of Credit Facility, Covenant Terms, Fixed Charge Coverage Ratio

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Line Of Credit Facility, Covenant Terms, Maximum Ratio Of Super Senior Liabilities To Cash And Cash Equivalent Investments

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Line Of Credit Facility, Covenant Terms, Utilization Threshold

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

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The average effective interest rate during the reporting period.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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