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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEGMENT INFORMATION
Stock-based compensation expense	$ 68.8	$ 64.1	$ 70.5
Corporate and unallocated
SEGMENT INFORMATION
Payroll costs	331.7	278.7	258.6
Stock-based compensation expense	67.1	63.1	70.3
Professional service expenses	95.2	87.1	77.9
Insurance costs	11.7	10.5	9.3
Other operating expenses	$ 76.4	$ 58.3	$ 28.1

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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