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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment information
Stock-based compensation expense	$ 15.6	$ 14.9	$ 30.9	$ 28.3
Corporate and unallocated
Segment information
Payroll costs	50.5	44.7	100.9	87.8
Stock-based compensation expense	15.6	14.9	30.9	28.3
Professional service expenses	18.4	11.8	35.9	24.2
Other operating expenses	$ 14.1	$ 11.6	$ 24.2	$ 21.4

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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- 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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