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PROPERTY AND EQUIPMENT, NET - Headquarters location (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property and Equipment, Net
Property held and used	$ 95.6	$ 82.6
Land	2.3
Property and equipment	95.6	$ 82.6
Chicago Headquarters Location
Property and Equipment, Net
Property held and used	12.6
Land	2.3
Property and equipment	10.3
Chicago Headquarters Location | Options
Property and Equipment, Net
Impairment charge	$ 8.1

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Property, Plant and Equipment, Excluding Land, Net

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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