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Customer Trust Fund - Investment of Customer Trust Fund (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Money market securities, investments carried at cost and other cash equivalents, Fair Value | $ 1,872.4 | $ 1,348.1 |
Invested customer trust funds, Fair Value | 3,632.9 | 3,174.9 |
Trust receivables, Fair Value | 16.6 | 29.2 | [1]
Total customer trust funds, Fair Value | 3,649.5 | 3,204.1 |
Money market securities, investments carried at cost and other cash equivalents, Amortized Cost | 1,872.4 | 1,348.1 |
Invested customer trust funds, Amortized Cost | 3,588.6 | 3,153.2 |
Trust receivables, Amortized Cost | 16.6 | 40.4 |
Total customer trust funds, Amortized Cost | 3,605.2 | 3,193.6 |
Amortized Cost | 1,716.2 | 1,805.1 |
Gross Unrealized Gain | 45.6 | 23.4 |
Gross Unrealized Loss | (1.3) | (1.7) |
Fair value | 1,760.5 | 1,826.8 |
U.S. Government and Agencies Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 542.3 | 542.4 |
Gross Unrealized Gain | 22.9 | 7.1 |
Gross Unrealized Loss |  | (0.3) |
Fair value | 565.2 | 549.2 |
Canadian and Provincial Government Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 375.2 | 406.7 |
Gross Unrealized Gain | 11.3 | 5.4 |
Gross Unrealized Loss |  | (0.7) |
Fair value | 386.5 | 411.4 |
Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 529.8 | 562.2 |
Gross Unrealized Gain | 9.3 | 9.0 |
Gross Unrealized Loss | (0.5) | (0.3) |
Fair value | 538.6 | 570.9 |
Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 247.0 | 270.0 |
Gross Unrealized Gain | 1.8 | 1.7 |
Gross Unrealized Loss | (0.8) | (0.3) |
Fair value | 248.0 | 271.4 |
Mortgage-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 17.9 | 19.8 |
Gross Unrealized Gain | 0.3 | 0.2 |
Gross Unrealized Loss |  | (0.1) |
Fair value | 18.2 | 19.9 |
Other Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 4.0 | 4.0 |
Fair value | $ 4.0 | $ 4.0 |
[1] | The fair value of trust receivables as of December 31, 2019, includes a loss of $11.2 million related to unrecovered duplicate payments resulting from the September 26, 2019, isolated service incident. Ceridian is liable for these unrecovered duplicate payments and has reimbursed the customer trust for the resulting losses as of March 31, 2020. Please refer to Note 13, “Commitments and Contingencies,” for further discussion of the September 26, 2019, isolated service incident.

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