FAIR VALUE MEASUREMENT - Fair values of debt obligations (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Mar. 16, 2022	Dec. 15, 2020	Jan. 12, 2017
3.650% Senior Notes
Debt
Interest rate (as a percent)	3.65%	3.65%	3.65%		3.65%
3.650% Senior Notes | Level 2
Debt
Debt obligations	$ 648.9	$ 638.4
1.625% Senior Notes
Debt
Interest rate (as a percent)	1.625%	1.625%	1.625%	1.625%
1.625% Senior Notes | Level 2
Debt
Debt obligations	$ 444.6	$ 416.2
3.000% Senior Notes
Debt
Interest rate (as a percent)	3.00%	3.00%	3.00%
3.000% Senior Notes | Level 2
Debt
Debt obligations	$ 278.3	$ 262.4