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Acquisitions Cash Paid for Current and Prior Years' Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
| 2021 |  | 2020 |  | 2019
Cost of investment: current-year acquisitions | $ | — |  |  | $ | 8.5 |  |  | $ | 0.6 |
Cost of investment: prior-year acquisitions | 28.0 |  |  | 45.9 |  |  | 15.8 |
Less: net cash acquired | — |  |  | (2.9) |  |  | — |
Total cost of investment | 28.0 |  |  | 51.5 |  |  | 16.4 |
Operating payments 1 | 39.1 |  |  | 2.9 |  |  | 9.3 |
Total cash paid for acquisitions 2 | $ | 67.1 |  |  | $ | 54.4 |  |  | $ | 25.7 |
1 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. 2 Of the total cash paid for acquisitions, $0.0, $4.9 and $0.6 for the years ended December 31, 2021, 2020 and 2019, 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, $28.0, $46.6 and $15.8 for the years ended December 31, 2021, 2020 and 2019, 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,
| 2021 |  | 2020 |  | 2019
Balance at beginning of period | $ | 93.1 |  |  | $ | 164.7 |  |  | $ | 167.9 |
Change in related noncontrolling interests balance | 2.2 |  |  | (5.4) |  |  | (2.8) |
Changes in redemption value of redeemable noncontrolling interests: |  |  |  |  |
Additions | 0.0 |  |  | 0.0 |  |  | 24.3 |
Redemptions and other | (41.9) |  |  | (20.6) |  |  | (24.9) |
Redemption value adjustments 1 | (37.8) |  |  | (45.6) |  |  | 0.2 |
Balance at end of period | $ | 15.6 |  |  | $ | 93.1 |  |  | $ | 164.7 |
1 Redemption value adjustments for the year ended December 31, 2021 were primarily attributable to the expiration of redemption provision related to redeemable noncontrolling interests.

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- Definition Cash Paid For Current And Prior Years' Acquisitions [Table Text Block] + References No definition available. + Details
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- 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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