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FAIR VALUE MEASUREMENT - Fair values of debt obligations (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Mar. 16, 2022	Dec. 15, 2020	Jan. 12, 2017
Debt
Debt obligations	$ 1,346.6	$ 1,305.7
Level 2
Debt
Debt obligations	$ 1,346.6	$ 1,305.7
3.650% Senior Notes
Debt
Interest rate (as a percent)	3.65%	3.65%			3.65%
3.650% Senior Notes | Level 2
Debt
Debt obligations	$ 643.8	$ 628.5
1.625% Senior Notes
Debt
Interest rate (as a percent)	1.625%	1.625%		1.625%
1.625% Senior Notes | Level 2
Debt
Debt obligations	$ 430.0	$ 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	$ 272.8	$ 264.5

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- Definition

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

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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