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Customer Trust Fund - Investment of Customer Trust Fund (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |
Money market securities, investments carried at cost and other cash equivalents, Fair Value | $ 2,701.2 | $ 872.3
Invested customer trust funds, Fair Value | 4,548.9 | 2,591.9
Trust receivables, Fair Value | 10.8 | 11.6
Total customer trust funds, Fair Value | 4,559.7 | 2,603.5
Money market securities, investments carried at cost and other cash equivalents, Amortized Cost | 2,701.2 | 872.3
Invested customer trust funds, Amortized Cost | 4,543.2 | 2,608.1
Trust receivables, Amortized Cost | 10.8 | 11.6
Total customer trust funds, Amortized Cost | 4,554.0 | 2,619.7
Amortized Cost | 1,842.0 | 1,735.8
Gross Unrealized Gain | 13.5 | 4.3
Gross Unrealized Loss | (7.8) | (20.5)
Fair value | 1,847.7 | 1,719.6
U.S. Government and Agencies Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 598.2 | 573.4
Gross Unrealized Gain | 1.1 | 0.2
Gross Unrealized Loss | (5.1) | (11.4)
Fair value | 594.2 | 562.2
Canadian and Provincial Government Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 396.4 | 392.5
Gross Unrealized Gain | 6.8 | 3.4
Gross Unrealized Loss | (0.3) | (1.4)
Fair value | 402.9 | 394.5
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 551.4 | 499.5
Gross Unrealized Gain | 4.8 | 0.5
Gross Unrealized Loss | (1.1) | (4.7)
Fair value | 555.1 | 495.3
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 257.0 | 247.1
Gross Unrealized Gain | 0.7 | 0.2
Gross Unrealized Loss | (1.1) | (2.7)
Fair value | 256.6 | 244.6
Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 24.3 | 8.5
Gross Unrealized Gain | 0.1 |
Gross Unrealized Loss | (0.1) | (0.2)
Fair value | 24.3 | 8.3
Other Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 14.7 | 14.8
Gross Unrealized Loss | (0.1) | (0.1)
Fair value | $ 14.6 | $ 14.7

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