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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment information
Stock-based compensation expense	$ 17.3	$ 15.9	$ 35.7	$ 33.0
Other operating expenses			24.4
Corporate and unallocated
Segment information
Payroll costs	61.2	56.5	126.3	111.8
Stock-based compensation expense	17.3	15.9	35.6	33.0
Professional service expenses	21.0	17.1	41.4	33.5
Intellectual property claim	16.9		$ 16.9
Other operating expenses	$ 12.3	$ 11.8		$ 23.8

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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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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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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