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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment information
Stock-based compensation expense	$ 18.4	$ 17.1
Corporate and unallocated
Segment information
Payroll costs	65.1	55.3
Stock-based compensation expense	18.3	17.1
Professional service expenses	20.4	16.3
Other operating expenses	$ 12.1	$ 12.1

X

- Definition

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

+ References

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-Publisher FASB
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- Definition

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

+ References

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-Publisher FASB
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- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

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- Definition

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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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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No definition available.

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