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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | $ 176.8 |
Other payable | 4.9 |
Recorded earn-out payable | 51.3 | $ 42.1
Total consideration | 233.0 |
Maximum potential earn-out payable | 98.9 |
Allocation of purchase price: |  |
Cash and equivalents | 4.5 |
Fiduciary cash | 9.1 |
Fiduciary receivables | 19.3 |
Other current assets | 14.9 |
Fixed assets | 0.1 |
Goodwill | 154.2 |
Deferred income tax, net | 13.6 |
Other assets | 0.1 |
Total assets acquired | 271.4 |
Fiduciary liabilities | (28.3) |
Other current liabilities | (6.5) |
Other long-term liabilities | (3.6) |
Total liabilities assumed | (38.4) |
Net assets acquired | 233.0 |
Purchased Customer Accounts and Other |  |
Allocation of purchase price: |  |
Intangible assets | 55.3 |
Non-compete Agreements |  |
Allocation of purchase price: |  |
Intangible assets | 0.3 |
Other Acquisitions |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | 176.8 |
Other payable | 4.9 |
Recorded earn-out payable | 51.3 |
Total consideration | 233.0 |
Maximum potential earn-out payable | 98.9 |
Allocation of purchase price: |  |
Cash and equivalents | 4.5 |
Fiduciary cash | 9.1 |
Fiduciary receivables | 19.3 |
Other current assets | 14.9 |
Fixed assets | 0.1 |
Goodwill | 154.2 |
Deferred income tax, net | 13.6 |
Other assets | 0.1 |
Total assets acquired | 271.4 |
Fiduciary liabilities | (28.3) |
Other current liabilities | (6.5) |
Other long-term liabilities | (3.6) |
Total liabilities assumed | (38.4) |
Net assets acquired | 233.0 |
Other Acquisitions | Purchased Customer Accounts and Other |  |
Allocation of purchase price: |  |
Intangible assets | 55.3 |
Other Acquisitions | Non-compete Agreements |  |
Allocation of purchase price: |  |
Intangible assets | $ 0.3 |

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