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Restructuring and Acquisition Charges Restructuring and Related Activities (Tables) | 9 Months Ended
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Sep. 30, 2023
Restructuring Cost and Reserve [Line Items] |
Restructuring, Impairment, and Other Activities Disclosure [Text Block] | Restructuring and acquisition charges are presented in the table below.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2023 | 2022 |  | 2023 | 2022
Severance and other employment-related charges | $ | 16.4 |  | 9.4 |  |  | $ | 47.9 |  | 21.0 |
Restructuring, pre-acquisition and post-acquisition charges | 15.5 |  | 11.4 |  |  | 28.8 |  | 39.5 |
Stock-based compensation expense for post-acquisition retention awards(1) | (0.4) |  | 0.3 |  |  | 2.9 |  | 5.7 |
Fair value adjustments to earn-out liabilities | 0.1 |  | (0.1) |  |  | (0.5) |  | 0.2 |
Restructuring and acquisition charges | $ | 31.6 |  | 21.0 |  |  | $ | 79.1 |  | 66.4 |
(1) Includes the impact of shares forfeited during the third quarter.

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