Business Combinations	12 Months Ended
Business Combinations	Dec. 31, 2023
Business Combinations [Abstract]
Business Combinations	Business Combinations In 2023, we completed six acquisitions that increased goodwill by $340.0 million. In addition, during 2023, we acquired additional equity interests in certain majority owned subsidiaries, which are accounted for as equity transactions, and no additional goodwill was recorded. None of the acquisitions in 2023, either individually or in the aggregate, were material to our results of operations or financial position. On January 2, 2024, we acquired Flywheel Digital, the digital commerce business of Ascential plc, for a net cash purchase price of approximately $845 million. Since the acquisition occurred subsequent to December 31, the allocation of the purchase price to the underlying assets acquired and liabilities assumed is subject to a formal valuation process that has not yet been completed. The major assets acquired include trade receivables, goodwill and intangible assets, and the major liabilities assumed include trade and other payables. The Flywheel Digital acquisition is not material to our results of operations and financial position. We will include the results of Flywheel Digital in our 2024 results of operations from the date of acquisition. In the fourth quarter of 2023 we incurred transaction costs of $14.5 million primarily related to the acquisition of Flywheel Digital. The evaluation of potential acquisitions is based on various factors, including specialized know-how, reputation, geographic coverage, competitive position and service offerings, as well as our experience and judgment. Our acquisition strategy is focused on acquiring the expertise of an assembled workforce in order to continue to build upon the core capabilities of our strategic business platforms and agency brands, through the expansion of their geographic area or their service capabilities to better serve our clients. Certain acquisitions include an initial payment at closing and provide for future additional contingent purchase price payments (earn-outs), which are derived using the performance of the acquired company and are based on predetermined formulas. At December 31, 2023 and 2022, contingent purchase price obligations were $229.5 million and $115.0 million, respectively, of which $62.4 million and $39.2 million, respectively, are recorded in other current liabilities. For each acquisition, we undertake a detailed review to identify other intangible assets that are required to be valued separately. We use several market participant measurements to determine fair value. This approach includes consideration of similar and recent transactions, as well as utilizing discounted expected cash flow methodologies, and when available and as appropriate, we use comparative market multiples to supplement our analysis. As is typical for most service businesses, a substantial portion of the intangible asset value we acquire is the specialized know-how of the workforce, which is treated as part of goodwill and is not valued separately. A significant portion of the identifiable intangible assets acquired is derived from customer relationships, including the related customer contracts, as well as trade names. One of the primary drivers in executing our acquisition strategy is the existence of, or the ability to, expand our existing client relationships. The expected benefits of our acquisitions are typically shared across multiple agencies and regions.