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FAIR VALUE MEASUREMENT - Fair values of debt obligations (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 15, 2020	Jan. 12, 2017
Debt
Debt obligations	$ 1,299.3	$ 1,319.1
Level 2
Debt
Debt obligations	1,299.3	1,319.1
Term Loan Agreement | Level 2
Debt
Debt obligations	$ 160.1	$ 70.0
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	$ 702.6	$ 744.0
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	$ 470.9	$ 505.1

X

- Definition

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

+ References

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- Definition

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

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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