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Geographic Areas (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Property and equipment, net	$ 310.6	$ 341.9
Revenue	1,391.7	1,106.8	$ 844.8
United States
Segment Reporting Information [Line Items]
Property and equipment, net	293.6	323.7
Revenue	706.5	575.7	455.9
International
Segment Reporting Information [Line Items]
Property and equipment, net	17.0	18.2
Revenue	$ 685.2	$ 531.1	$ 388.9

X

- Definition

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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