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Segment Reporting
 9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
Segment Reporting Segment ReportingOur branded agency networks operate in the advertising, marketing and corporate communications services industry, and are organized into agency networks, virtual client networks, regional reporting units and operating groups or practice areas. Our networks, virtual client networks and agencies increasingly share clients and provide clients with integrated services. The main economic components of each agency are employee compensation and related costs, direct service costs and occupancy and other costs, which include rent and occupancy costs, technology costs and other overhead expenses. Therefore, given these similarities, we aggregate our six operating segments, which are our agency networks, into one reporting segment.
The agency networks' regional reporting units comprise three regions: the Americas, EMEA and Asia-Pacific. The regional reporting units monitor the performance of and are responsible for the agencies in their region. Agencies within the regional reporting units serve similar clients in similar industries and, in many cases, the same clients, and have similar economic characteristics.
Revenue and long-lived assets and goodwill by geographic region:
AmericasEMEAAsia-Pacific
September 30, 2023   
Revenue - Three months ended$2,082.6 $1,068.4 $427.1 
Revenue - Nine months ended$6,146.8 $3,213.4 $1,271.1 
Long-lived assets and goodwill$7,742.2 $3,355.4 $695.4 
September 30, 2022
Revenue - Three months ended$2,046.3 $970.2 $426.9 
Revenue - Nine months ended$6,002.4 $3,133.9 $1,284.6 
Long-lived assets and goodwill$7,753.2 $3,039.2 $724.2