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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Recorded earn-out payable | $ 40.2 | $ 16.9
Other Acquisitions |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | 127.2 |
Other payable | 2.3 |
Recorded earn-out payable | 40.2 |
Total consideration | 169.7 |
Maximum potential earn-out payable | 74.2 |
Allocation of purchase price: |  |
Cash and equivalents | 4.9 |
Fiduciary cash | 7.0 |
Fiduciary receivables | 9.0 |
Other current assets | 11.1 |
Goodwill | 116.8 |
Deferred income tax, net | 19.1 |
Other assets | 0.2 |
Total assets acquired | 195.0 |
Fiduciary liabilities | (16.0) |
Other current liabilities | (6.3) |
Other long-term liabilities | (3.0) |
Total liabilities assumed | (25.3) |
Net assets acquired | 169.7 |
Other Acquisitions | Purchased Customer Accounts and Other |  |
Allocation of purchase price: |  |
Intangible assets | 26.6 |
Other Acquisitions | Non-compete Agreements |  |
Allocation of purchase price: |  |
Intangible assets | $ 0.3 |

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