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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment information
Stock-based compensation expense	$ 16.0	$ 14.1	$ 46.9	$ 42.4
Corporate and unallocated
Segment information
Payroll costs	50.1	42.1	151.0	129.9
Stock-based compensation expense	16.0	14.0	46.9	42.4
Professional service expenses	13.3	12.3	49.2	36.5
Other operating expenses	$ 11.1	$ 8.5	$ 35.3	$ 30.0

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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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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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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