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Customer Trust Fund - Investment of Customer Trust Fund (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |
Money market securities, investments carried at cost and other cash equivalents, Fair Value | $ 1,970.4 | $ 2,309.3
Invested customer trust funds, Fair Value | 3,697.8 | 4,091.4
Trust receivables, Fair Value | 6.1 | 8.3
Total customer trust funds, Fair Value | 3,703.9 | 4,099.7
Money market securities, investments carried at cost and other cash equivalents, Amortized Cost | 1,970.4 | 2,309.3
Invested customer trust funds, Amortized Cost | 3,722.2 | 4,097.2
Trust receivables, Amortized Cost | 6.1 | 8.3
Total customer trust funds, Amortized Cost | 3,728.3 | 4,105.5
Amortized Cost | 1,751.8 | 1,787.9
Gross Unrealized Gain | 4.0 | 7.5
Gross Unrealized Loss | (28.4) | (13.3)
Fair value | 1,727.4 | 1,782.1
U.S. Government and Agencies Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 573.3 | 584.6
Gross Unrealized Gain |  | 0.1
Gross Unrealized Loss | (16.5) | (7.1)
Fair value | 556.8 | 577.6
Canadian and Provincial Government Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 404.1 | 418.2
Gross Unrealized Gain | 3.6 | 6.6
Gross Unrealized Loss | (1.9) | (1.5)
Fair value | 405.8 | 423.3
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 498.8 | 472.3
Gross Unrealized Gain | 0.4 | 0.8
Gross Unrealized Loss | (6.1) | (2.5)
Fair value | 493.1 | 470.6
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 247.6 | 280.8
Gross Unrealized Loss | (3.5) | (1.8)
Fair value | 244.1 | 279.0
Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 11.2 | 15.0
Gross Unrealized Loss | (0.3) | (0.2)
Fair value | 10.9 | 14.8
Other Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 16.8 | 17.0
Gross Unrealized Loss | (0.1) | (0.2)
Fair value | $ 16.7 | $ 16.8

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