DEBT - Narrative (Details)		12 Months Ended
	Jun. 30, 2021 USD ($) extension	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 EUR (€)	Oct. 31, 2020 USD ($)
Debt Instrument [Line Items]
Short-term borrowing		$ 147,276,000	$ 52,200,000
Money Market Borrowing Arrangement
Debt Instrument [Line Items]
Short-term borrowing		0	0
Short-term borrowing, maximum borrowing capacity						$ 30,000,000
Amended Revolving Credit Facility Maturing In June 2026
Debt Instrument [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
Interest and fees		1,100,000	1,500,000
Amended Revolving Credit Facility Maturing In June 2026 | United States
Debt Instrument [Line Items]
Short-term borrowing		133,000,000
Amended Revolving Credit Facility Maturing In June 2026 | United Kingdom
Debt Instrument [Line Items]
Short-term borrowing		11,400,000		€ 10,000,000
Notes payable
Debt Instrument [Line Items]
Remaining outstanding under the amended term facility		56,000,000	112,000,000
Prior Credit Facility
Debt Instrument [Line Items]
Short-term borrowing			52,000,000		€ 0
Unsecured Lines Of Credit
Debt Instrument [Line Items]
Line of credit facility, average outstanding amount		$ 37,800,000	$ 108,100,000
Short-term debt, weighted average interest rate, over time		1.10%	1.50%