INDEBTEDNESS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Long-term debt
Borrowings under line of credit	$ 219.5	$ 111.0
Loan facility quarterly installment rate	5.00%
Credit Agreement | Credit Facility | Base rate
Long-term debt
Borrowings under line of credit	$ 15.0		$ 10.0
Basis spread on variable rate (as percent)	3.75%		5.25%
Credit Agreement | Credit Facility | LIBOR
Long-term debt
Borrowings under line of credit	$ 289.5		$ 128.5
Basis spread on variable rate (as percent)	2.42%		3.27%
Credit Agreement | Letter of Credit
Long-term debt
Interest rate			1.50%
Amended Credit Agreement | Term loan
Long-term debt
Interest rate	2.49%		3.30%
Amended Credit Agreement | Multi-currency term loans
Long-term debt
Interest rate	1.50%		1.50%