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Restructuring and Acquisition Charges Restructuring and Related Activities (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
(in millions) | 2022 | 2021 |  | 2022 | 2021
Severance and other employment-related charges | $ | 9.4 |  | 1.2 |  |  | $ | 21.0 |  | 2.1 |
Restructuring, pre-acquisition and post-acquisition charges | 11.4 |  | 11.2 |  |  | 39.5 |  | 32.6 |
Stock-based compensation expense for HFF retention awards | 0.3 |  | 3.2 |  |  | 5.7 |  | 15.2 |
Fair value adjustments to earn-out liabilities | (0.1) |  | — |  |  | 0.2 |  | 1.0 |
Restructuring and acquisition charges | $ | 21.0 |  | 15.6 |  |  | $ | 66.4 |  | 50.9 |

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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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