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FAIR VALUE MEASUREMENT - Fair values of debt obligations (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Mar. 16, 2022	Dec. 15, 2020	Jan. 12, 2017
Debt
Debt obligations	$ 1,294.1	$ 1,305.7
Level 2
Debt
Debt obligations	$ 1,294.1	$ 1,305.7
3.650% Senior Notes due January 2027
Debt
Interest rate (as a percent)	3.65%	3.65%			3.65%
3.650% Senior Notes due January 2027 | Level 2
Debt
Debt obligations	$ 627.9	$ 628.5
1.625% Senior Notes due December 2030
Debt
Interest rate (as a percent)	1.625%	1.625%		1.625%
1.625% Senior Notes due December 2030 | Level 2
Debt
Debt obligations	$ 408.8	$ 412.7
3.000% Senior Notes due March 2032
Debt
Interest rate (as a percent)	3.00%	3.00%	3.00%
3.000% Senior Notes due March 2032 | Level 2
Debt
Debt obligations	$ 257.4	$ 264.5

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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