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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment information
Stock-based compensation expense	$ 70.3	$ 63.4	$ 57.1
Corporate and unallocated
Segment information
Payroll costs	234.1	203.3	174.9
Stock-based compensation expense	69.9	63.4	57.1
Professional service expenses	67.6	78.5	53.6
Insurance costs	7.5	6.1	6.0
Other operating expenses	$ 39.0	$ 42.8	$ 34.8

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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Insurance and claims costs directly related to goods produced and sold, or services rendered, during the reporting period.

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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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