FAIR VALUE MEASUREMENT - Fair values of debt obligations (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Mar. 16, 2022	Dec. 15, 2020	Jan. 12, 2017
Debt
Debt obligations	$ 1,317.0	$ 1,305.7
Level 2
Debt
Debt obligations	$ 1,317.0	$ 1,305.7
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	$ 638.4	$ 628.5
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	$ 416.2	$ 412.7
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	$ 262.4	$ 264.5