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Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Business Combinations [Abstract] |  |  |  |
Beginning balance | $ 231.5 | $ 232.9 | $ 251.7 | $ 291.0
Additions to estimated acquisition earn-out payables | 11.1 | 25.2 | 51.3 | 42.1
Assumed acquisition earn-out payables |  | 34.8 |  | 34.8
Payments for estimated acquisition earn-out payables | (11.0) | (10.6) | (74.5) | (77.1)
Subtotal | 231.6 | 282.3 | 228.5 | 290.8
Net change in earnings from estimated acquisition earn-out payables: |  |  |  |
Change in fair value on estimated acquisition earn-out payables | 27.8 | (28.5) | 23.5 | (38.1)
Interest expense accretion | 2.1 | 1.9 | 5.9 | 5.0
Net change in earnings from estimated acquisition earn-out payables | 29.9 | (26.6) | 29.4 | (33.1)
Foreign currency translation adjustments during the year | (3.3) | (5.8) | 0.3 | (7.8)
Ending balance | $ 258.2 | $ 249.9 | $ 258.2 | $ 249.9

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