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Restructuring and Acquisition Charges Restructuring and Related Activities (Tables) | 9 Months Ended
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Sep. 30, 2021
Restructuring Cost and Reserve [Line Items] |
Restructuring Charges and Related Payment Activity | The following tables show the accrual activity and payments relating to cash-based Restructuring and acquisition charges.
(in millions) | Severance & Employment-Related | Lease Exit | Restructuring, Acquisition and Integration Costs |  | Total
December 31, 2020 | $ | 41.3 |  | 2.5 |  | 1.2 |  |  | $ | 45.0 |
Accruals | 2.1 |  | 7.7 |  | 24.9 |  |  | 34.7 |
Payments made | (29.0) |  | (9.4) |  | (19.9) |  |  | (58.3) |
September 30, 2021 | $ | 14.4 |  | 0.8 |  | 6.2 |  |  | $ | 21.4 |
(in millions) | Severance & Employment-Related | Lease Exit | Other Restructuring, Acquisition and Integration Costs |  | Total
December 31, 2019 | $ | 24.3 |  | 8.4 |  | 3.8 |  |  | $ | 36.5 |
Accruals | 27.6 |  | 9.3 |  | 16.6 |  |  | 53.5 |
Payments made | (22.1) |  | (16.0) |  | (20.4) |  |  | (58.5) |
September 30, 2020 | $ | 29.8 |  | 1.7 |  | — |  |  | $ | 31.5 |
Restructuring, Impairment, and Other Activities Disclosure [Text Block] | Restructuring and acquisition charges are presented in table below.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2021 | 2020 |  | 2021 | 2020
Severance and other employment-related charges | $ | 1.2 |  | 19.3 |  |  | $ | 2.1 |  | 27.6 |
Restructuring, pre-acquisition and post-acquisition charges | 11.2 |  | 8.6 |  |  | 32.6 |  | 25.9 |
Stock-based compensation expense for HFF retention awards | 3.2 |  | 6.2 |  |  | 15.2 |  | 30.5 |
Fair value adjustments to earn-out liabilities | — |  | (0.6) |  |  | 1.0 |  | (8.2) |
Restructuring and acquisition charges | $ | 15.6 |  | 33.5 |  |  | $ | 50.9 |  | 75.8 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The entire disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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