DEBT - Narrative (Details)	Jun. 30, 2021 USD ($) extension	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Oct. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Short-term borrowing	$ 2,965,000	$ 52,200,000
Commercial Paper
Line of Credit Facility [Line Items]
Short-term borrowing, maximum borrowing capacity				$ 30,000,000
Short-term borrowing	$ 0	0
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
Long-term line of credit	0
Compensating balance, amount	0
Prior Credit Facility
Line of Credit Facility [Line Items]
Long-term line of credit		52,000,000.0	€ 0
Senior unsecured debts 1.4% USD floating swapped to 1.36% EUR fixed, equal annual installments through 2022
Line of Credit Facility [Line Items]
Remaining outstanding under the amended term facility	$ 112,000,000	$ 112,000,000