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Restructuring and Acquisition Charges (Tables) | 12 Months Ended
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Dec. 31, 2020
Restructuring and Related Activities [Abstract] |
Restructuring, Impairment, and Other Activities Disclosure | Restructuring and acquisition charges are presented in table below.
| Year Ended December 31,
(in millions) | 2020 | 2019 | 2018
Severance and other employment-related charges | $ | 69.0 |  | 31.1 |  | 25.5 |
Restructuring, pre-acquisition and post-acquisition charges | 51.5 |  | 96.9 |  | 5.9 |
Stock-based compensation expense for HFF retention awards | 36.7 |  | 28.0 |  | — |
Fair value adjustments to earn-out liabilities | (14.8) |  | 28.4 |  | 7.4 |
Restructuring and acquisition charges | $ | 142.4 |  | 184.4 |  | 38.8 |
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 | Other Restructuring and Acquisition Costs | Total
December 31, 2017 | $ | 14.2 |  | 5.7 |  | 1.4 |  |  | $ | 21.3 |
Accruals | 25.5 |  | 0.7 |  | 5.2 |  |  | 31.4 |
Payments made | (25.7) |  | (5.8) |  | (6.1) |  |  | (37.6) |
December 31, 2018 | 14.0 |  | 0.6 |  | 0.5 |  |  | 15.1 |
Accruals | 31.1 |  | 11.1 |  | 85.8 |  |  | 128.0 |
Payments made | (20.8) |  | (3.3) |  | (82.5) |  |  | (106.6) |
December 31, 2019 | 24.3 |  | 8.4 |  | 3.8 |  |  | 36.5 |
Accruals | 69.0 |  | 25.0 |  | 26.5 |  |  | 120.5 |
Payments made | (52.0) |  | (30.9) |  | (29.1) |  |  | (112.0) |
December 31, 2020 | $ | 41.3 |  | 2.5 |  | 1.2 |  |  | $ | 45.0 |

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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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