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Acquisitions Cash Paid for Current and Prior Years' Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2020
Business Combinations [Abstract] |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed | The following table summarizes the fair values of the assets acquired and liabilities assumed at the closing date:
| October 1, 2018
Cash and cash equivalents | $ | 13.3 |
Accounts receivable | 112.9 |
Accounts receivable, billable to clients | 8.3 |
Other current assets | 28.2 |
Property and equipment, net | 159.7 |
Deferred income taxes | (0.6) |
Goodwill | 1,110.8 |
Intangible assets, net | 995.0 |
Other non-current assets | 8.3 |
Accounts payable | (37.1) |
Accrued liabilities | (46.9) |
Contract liabilities | (23.2) |
Other non-current liabilities | (0.8) |
Net assets acquired | $ | 2,327.9 |
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination | The fair values of the identifiable intangible assets acquired at the closing date are as follows:
| Fair Value |  | Weighted Average Amortization Period (Years)
Customer lists | $ | 600.0 |  |  | 15.0
Know-how and technology | 235.0 |  |  | 9.0
Trade names | 160.0 |  |  | 15.0 to indefinite
Total intangible assets | $ | 995.0 |  |  |
Business Acquisition, Pro Forma Information | The pro forma combined results of operations shown below include the business combination accounting effects resulting from the acquisition.
| (Unaudited)
| December 31,
2018
Pro forma revenues | $ | 10,230.4 |
Pro forma net income | 642.2 |
Cash Paid For Current And Prior Years' Acquisitions [Table Text Block] | Details of cash paid for current and prior years' acquisitions are listed below.
| Years ended December 31,
| 2020 |  | 2019 |  | 2018
Cost of investment: current-year acquisitions 1 | $ | 8.5 |  |  | $ | 0.6 |  |  | $ | 2,323.4 |
Cost of investment: prior-year acquisitions | 45.9 |  |  | 15.8 |  |  | 33.9 |
Less: net cash acquired | (2.9) |  |  | — |  |  | (13.8) |
Total cost of investment | 51.5 |  |  | 16.4 |  |  | 2,343.5 |
Operating payments 2 | 2.9 |  |  | 9.3 |  |  | 19.4 |
Total cash paid for acquisitions 3 | $ | 54.4 |  |  | $ | 25.7 |  |  | $ | 2,362.9 |
1 The cost of investment: current-year acquisitions line significantly increased in the year ended December 31, 2018, primarily as a result of payments related to the acquisition of Acxiom. 2 Represents cash payments for amounts that have been recognized in operating expenses since the date of acquisition either relating to adjustments to estimates in excess of the initial value of contingent payments recorded or were contingent upon the future employment of the former owners of the acquired companies. Amounts are reflected in the operating section of the Consolidated Statements of Cash Flows. 3 Of the total cash paid for acquisitions, $4.9, $0.6 and $2,309.8 for the years ended December 31, 2020, 2019 and 2018, respectively, are classified under the investing section of the Consolidated Statements of Cash Flows as acquisitions, net of cash acquired. These amounts relate to initial payments for new transactions. Of the total cash paid for acquisitions, $46.6, $15.8 and $33.7 for the years ended December 31, 2020, 2019 and 2018, respectively, are classified under the financing section of the Consolidated Statements of Cash Flows as acquisition-related payments. These amounts relate to deferred payments and increases in our ownership interest for prior acquisitions.
Redeemable Noncontrolling Interest | The following table presents changes in our redeemable noncontrolling interests.
| Years ended December 31,
| 2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | 164.7 |  |  | $ | 167.9 |  |  | $ | 252.1 |
Change in related noncontrolling interests balance | (5.4) |  |  | (2.8) |  |  | (10.7) |
Changes in redemption value of redeemable noncontrolling interests: |  |  |  |  |
Additions | 0.0 |  |  | 24.3 |  |  | 0.0 |
Redemptions and other | (20.6) |  |  | (24.9) |  |  | (33.7) |
Redemption value adjustments 1 | (45.6) |  |  | 0.2 |  |  | (39.8) |
Balance at end of period | $ | 93.1 |  |  | $ | 164.7 |  |  | $ | 167.9 |
1 Redemption value adjustments for the year ended December 31, 2020 were primarily attributable to the expiration of redemption provisions related to redeemable noncontrolling interests.

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of finite-lived and indefinite-lived intangible assets acquired as part of a business combination. + References No definition available. + Details
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- Definition Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity. + References No definition available. + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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