Derivatives and Hedging Instruments - Notional Amount (Details) - Cash flow hedge - Derivatives Designated as Hedging Instruments - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
2024 Cap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 342.9	$ 319.1
2025 Cap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	342.9
2023 Euro IR Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	117.4	103.5
2024 Euro IR Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	487.1	429.6
2023 SOFR IR Swaps - U.S.Facility
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	150.0	$ 150.0
2025 SOFR IR Swaps - U.S.Facility
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	125.0
2025 SOFR IR Swaps - Global Senior Facility
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 150.0

ENCORE CAPITAL GROUP INC 10-Q