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Customer Funds - Investment of Customer Funds (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Money market securities, investments carried at cost and other cash equivalents, Fair Value | $ 2,105.0 | $ 2,027.1
Invested customer funds, Fair Value | 4,268.0 | 3,746.2
Receivables, Fair Value | 16.0 | 13.2
Total customer funds, Fair Value | 4,284.0 | 3,759.4
Money market securities, investments carried at cost and other cash equivalents, Amortized Cost | 2,105.0 | 2,027.1
Invested customer funds, Amortized Cost | 4,221.3 | 3,684.6
Receivables, Amortized Cost | 16.0 | 13.2
Total customer funds, Amortized Cost | 4,237.3 | 3,697.8
Amortized Cost | 2,116.3 | 1,657.5
Gross Unrealized Gain | 49.6 | 61.7
Gross Unrealized Loss | (2.9) | (0.1)
Fair value | 2,163.0 | 1,719.1
U.S. Government and Agencies Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 541.9 | 494.0
Gross Unrealized Gain | 17.7 | 21.6
Gross Unrealized Loss | (2.3) | (0.1)
Fair value | 557.3 | 515.5
Canadian and Provincial Government Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 400.2 | 396.4
Gross Unrealized Gain | 12.4 | 15.5
Gross Unrealized Loss | (0.1) |
Fair value | 412.5 | 411.9
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 420.3 | 548.5
Gross Unrealized Gain | 15.5 | 19.4
Gross Unrealized Loss | (0.3) |
Fair value | 435.5 | 567.9
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 192.7 | 192.2
Gross Unrealized Gain | 3.9 | 4.9
Fair value | 196.6 | 197.1
Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7.4 | 9.9
Gross Unrealized Gain | 0.1 | 0.2
Fair value | 7.5 | 10.1
Other Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 44.5 | 16.5
Gross Unrealized Gain |  | 0.1
Gross Unrealized Loss | (0.2) |
Fair value | 44.3 | $ 16.6
Other Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 509.3 |
Fair value | $ 509.3 |

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