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Acquisitions Cash Paid for Current and Prior Years' Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2019
Business Combinations [Abstract] |
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,
| 2019 |  | 2018 |  | 2017
Cost of investment: current-year acquisitions 1 | $ | 0.6 |  |  | $ | 2,323.4 |  |  | $ | 36.8 |
Cost of investment: prior-year acquisitions | 15.8 |  |  | 33.9 |  |  | 54.6 |
Less: net cash acquired | — |  |  | (13.8 | ) |  | (7.1 | )
Total cost of investment | 16.4 |  |  | 2,343.5 |  |  | 84.3 |
Operating payments 2 | 9.3 |  |  | 19.4 |  |  | 47.1 |
Total cash paid for acquisitions 3 | $ | 25.7 |  |  | $ | 2,362.9 |  |  | $ | 131.4 |
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, $0.6, $2,309.8 and $30.6 for the years ended December 31, 2019, 2018 and 2017, 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, $15.8, $33.7 and $53.7 for the years ended December 31, 2019, 2018 and 2017, 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.

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