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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Cash paid | $ 695.1 |  |
Common stock issued | 18.3 | $ 14.7 | $ 9.9
Other payable | 12.2 |  |
Recorded earn-out payable | 67.2 | $ 73.3 | $ 75.7
Total consideration | 792.8 |  |
Maximum potential earn-out payable | 142.5 |  |
Allocation of purchase price: |  |  |
Cash and equivalents | 21.8 |  |
Fiduciary cash | 42.6 |  |
Fiduciary receivables | 67.6 |  |
Other current assets | 71.8 |  |
Goodwill | 608.7 |  |
Purchased customer accounts and other | 167.4 |  |
Deferred income tax, net | 4.9 |  |
Other assets | 12.2 |  |
Total assets acquired | 997.0 |  |
Fiduciary liabilities | (110.3) |  |
Other current liabilities | (52.3) |  |
Deferred income tax, net | (16.6) |  |
Other long-term liabilities | (25.0) |  |
Total liabilities assumed | (204.2) |  |
Net assets acquired | 792.8 |  |
Kentro Capital Limited | Retail |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Cash paid | 402.5 |  |
Common stock issued | 18.3 |  |
Other payable | 2.2 |  |
Total consideration | 423.0 |  |
Allocation of purchase price: |  |  |
Cash and equivalents | 8.5 |  |
Fiduciary cash | 27.3 |  |
Fiduciary receivables | 38.8 |  |
Other current assets | 37.8 |  |
Goodwill | 358.7 |  |
Purchased customer accounts and other | 66.0 |  |
Other assets | 6.1 |  |
Total assets acquired | 543.2 |  |
Fiduciary liabilities | 66.1 |  |
Other current liabilities | 22.6 |  |
Deferred income tax, net | 16.6 |  |
Other long-term liabilities | 14.9 |  |
Total liabilities assumed | 120.2 |  |
Net assets acquired | 423.0 |  |
Berkeley Insurance Group Limited | Retail |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Cash paid | 48.0 |  |
Other payable | 1.3 |  |
Recorded earn-out payable | 15.4 |  |
Total consideration | 64.7 |  |
Maximum potential earn-out payable | 21.0 |  |
Allocation of purchase price: |  |  |
Cash and equivalents | 0.4 |  |
Fiduciary cash | 2.8 |  |
Fiduciary receivables | 2.2 |  |
Other current assets | 10.9 |  |
Goodwill | 43.3 |  |
Purchased customer accounts and other | 22.0 |  |
Other assets | 0.5 |  |
Total assets acquired | 82.1 |  |
Fiduciary liabilities | 5.0 |  |
Other current liabilities | 12.2 |  |
Other long-term liabilities | 0.2 |  |
Total liabilities assumed | 17.4 |  |
Net assets acquired | 64.7 |  |
Other Acquisitions | Various |  |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |  |
Cash paid | 244.6 |  |
Other payable | 8.7 |  |
Recorded earn-out payable | 51.8 |  |
Total consideration | 305.1 |  |
Maximum potential earn-out payable | 121.5 |  |
Allocation of purchase price: |  |  |
Cash and equivalents | 12.9 |  |
Fiduciary cash | 12.5 |  |
Fiduciary receivables | 26.6 |  |
Other current assets | 23.1 |  |
Goodwill | 206.7 |  |
Purchased customer accounts and other | 79.4 |  |
Deferred income tax, net | 4.9 |  |
Other assets | 5.6 |  |
Total assets acquired | 371.7 |  |
Fiduciary liabilities | 39.2 |  |
Other current liabilities | 17.5 |  |
Other long-term liabilities | 9.9 |  |
Total liabilities assumed | 66.6 |  |
Net assets acquired | $ 305.1 |  |

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