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Business Combinations - Schedule of Major Classes of Assets and Liabilities Allocated to Purchase Price (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 2,311.5 | $ 2,031.8 | $ 1,973.5
Ascender HCM Pty Ltd. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash and equivalents | 3.1 |  |
Restricted cash | 2.0 |  |
Trade receivables, prepaid expenses, and other current assets | 15.8 |  |
Customer funds | 16.2 |  |
Property, plant, and equipment and other assets | 20.2 |  |
Goodwill | 275.7 |  |
Other intangible assets, net | 117.5 |  |
Accounts payable and other current liabilities | (30.5) |  |
Customer funds obligations | (16.1) |  |
Other non-current liabilities | (44.3) |  |
Total purchase price | $ 359.6 |  |

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