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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 | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business Combinations [Abstract] |  |  |
Beginning balance | $ 291.0 | $ 258.9 | $ 161.5
Additions to estimated acquisition earn-out payables from new acquisitions | 73.3 | 75.8 | 131.4
Assumed estimated acquisition earn-out payables | 34.8 |  |
Payments for estimated acquisition earn-out payables | (106.3) | (83.6) | (29.5)
Subtotal | 292.8 | 251.1 | 263.4
Net change in earnings from estimated acquisition earn-out payables: |  |  |
Change in fair value on estimated acquisition earn-out payables | (45.9) | 34.2 | (11.8)
Interest expense accretion | 7.0 | 6.2 | 7.3
Net change in earnings from estimated acquisition earn- out payables | (38.9) | 40.4 | (4.5)
Foreign currency translation adjustments during the year | (2.3) | (0.5) |
Ending balance | $ 251.6 | $ 291.0 | $ 258.9

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