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Restructuring and Acquisition Charges Restructuring and Related Activities (Tables) | 6 Months Ended
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Jun. 30, 2022
Restructuring Cost and Reserve [Line Items] |
Restructuring, Impairment, and Other Activities Disclosure [Text Block] | Restructuring and acquisition charges are presented in table below.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2022 | 2021 |  | 2022 | 2021
Severance and other employment-related charges | $ | 8.3 |  | (0.9) |  |  | $ | 11.6 |  | 0.9 |
Restructuring, pre-acquisition and post-acquisition charges | 13.9 |  | 11.9 |  |  | 28.1 |  | 21.4 |
Stock-based compensation expense for HFF retention awards | 2.7 |  | 6.0 |  |  | 5.4 |  | 12.0 |
Fair value adjustments to earn-out liabilities | 1.0 |  | 1.1 |  |  | 0.3 |  | 1.0 |
Restructuring and acquisition charges | $ | 25.9 |  | 18.1 |  |  | $ | 45.4 |  | 35.3 |

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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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