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DEBT - Narrative (Details) | Jun. 30, 2021 USD ($) extension | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Oct. 31, 2020 USD ($)
--- | --- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |  |
Short-term borrowing |  | $ 58,583,000 |  | $ 52,200,000 |  |
Commercial Paper |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Short-term borrowing |  | 0 |  | 0 |  |
Short-term borrowing, maximum borrowing capacity |  |  |  |  |  | $ 30,000,000
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, number of extensions | extension | 2 |  |  |  |  |
Line of credit facility, duration of extension (in years) | 1 year |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 600,000,000 |  |  |  |  |
Line of credit facility, increase limit | $ 300,000,000 |  |  |  |  |
Compensating balance, amount |  | 0 |  |  |  |
Revolving Credit Facility | United States |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Short-term borrowing |  | 47,000,000 |  |  |  |
Revolving Credit Facility | United Kingdom |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Short-term borrowing |  | 11,600,000 | € 10,000,000 |  |  |
Prior Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Short-term borrowing |  |  |  | 52,000,000 | € 0 |
Senior unsecured debts 1.26% USD floating swapped to 1.36% EUR fixed, due in 2022 |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Remaining outstanding under the amended term facility |  | $ 56,000,000 |  | $ 112,000,000 |  |

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