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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment information
Stock-based compensation expense	$ 17.1	$ 15.3
Corporate and unallocated
Segment information
Payroll costs	55.3	50.4
Stock-based compensation expense	17.1	15.3
Professional service expenses	16.3	17.5
Other operating expenses	$ 12.1	$ 10.1

X

- Definition

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

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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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- 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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