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Customer Trust Funds (Tables) | 6 Months Ended
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Jun. 30, 2018
Schedule of Amortized Cost and Fair Values of Investments of Customer Trust Funds Available for Sale | Investments of Customer Trust Funds at June 30, 2018
|  | Amortized |  |  | Gross Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
Money market securities, investments carried at cost and other cash equivalents |  | $ | 1,970.4 |  |  |  |  |  |  |  |  |  |  | $ | 1,970.4 |
Available for sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency securities |  |  | 573.3 |  |  |  | — |  |  |  | (16.5 | ) |  |  | 556.8 |
Canadian and provincial government securities |  |  | 404.1 |  |  |  | 3.6 |  |  |  | (1.9 | ) |  |  | 405.8 |
Corporate debt securities |  |  | 498.8 |  |  |  | 0.4 |  |  |  | (6.1 | ) |  |  | 493.1 |
Asset-backed securities |  |  | 247.6 |  |  |  | — |  |  |  | (3.5 | ) |  |  | 244.1 |
Mortgage-backed securities |  |  | 11.2 |  |  |  | — |  |  |  | (0.3 | ) |  |  | 10.9 |
Other securities |  |  | 16.8 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 16.7 |
Total available for sale investments |  |  | 1,751.8 |  |  |  | 4.0 |  |  |  | (28.4 | ) |  |  | 1,727.4 |
Invested customer trust funds |  |  | 3,722.2 |  |  | $ | 4.0 |  |  | $ | (28.4 | ) |  |  | 3,697.8 |
Trust receivables |  |  | 6.1 |  |  |  |  |  |  |  |  |  |  |  | 6.1 |
Total customer trust funds |  | $ | 3,728.3 |  |  |  |  |  |  |  |  |  |  | $ | 3,703.9 |
Investments of Customer Trust Funds at December 31, 2017
|  | Amortized |  |  | Gross Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
Money market securities, investments carried at cost and other cash equivalents |  | $ | 2,309.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,309.3 |
Available for sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency securities |  |  | 584.6 |  |  |  | 0.1 |  |  |  | (7.1 | ) |  |  | 577.6 |
Canadian and provincial government securities |  |  | 418.2 |  |  |  | 6.6 |  |  |  | (1.5 | ) |  |  | 423.3 |
Corporate debt securities |  |  | 472.3 |  |  |  | 0.8 |  |  |  | (2.5 | ) |  |  | 470.6 |
Asset-backed securities |  |  | 280.8 |  |  |  | — |  |  |  | (1.8 | ) |  |  | 279.0 |
Mortgage-backed securities |  |  | 15.0 |  |  |  | — |  |  |  | (0.2 | ) |  |  | 14.8 |
Other securities |  |  | 17.0 |  |  |  | — |  |  |  | (0.2 | ) |  |  | 16.8 |
Total available for sale investments |  |  | 1,787.9 |  |  |  | 7.5 |  |  |  | (13.3 | ) |  |  | 1,782.1 |
Invested customer trust funds |  |  | 4,097.2 |  |  | $ | 7.5 |  |  | $ | (13.3 | ) |  |  | 4,091.4 |
Trust receivables |  |  | 8.3 |  |  |  |  |  |  |  |  |  |  |  | 8.3 |
Total customer trust funds |  | $ | 4,105.5 |  |  |  |  |  |  |  |  |  |  | $ | 4,099.7 |
Schedule of Unrealized Losses and Fair Value | The following represents the gross unrealized losses and the related fair value of the investments of customer trust funds available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2018.
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
|  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government and agency securities |  | $ | (11.4 | ) |  | $ | 442.8 |  |  | $ | (5.1 | ) |  | $ | 111.6 |  |  | $ | (16.5 | ) |  | $ | 554.4 |
Canadian and provincial government securities |  |  | (0.4 | ) |  |  | 35.9 |  |  |  | (1.6 | ) |  |  | 99.4 |  |  |  | (2.0 | ) |  |  | 135.3 |
Corporate debt securities |  |  | (3.7 | ) |  |  | 259.7 |  |  |  | (2.3 | ) |  |  | 120.8 |  |  |  | (6.0 | ) |  |  | 380.5 |
Asset-backed securities |  |  | (2.1 | ) |  |  | 150.2 |  |  |  | (1.3 | ) |  |  | 82.3 |  |  |  | (3.4 | ) |  |  | 232.5 |
Mortgage-backed securities |  |  | (0.1 | ) |  |  | 2.6 |  |  |  | (0.3 | ) |  |  | 8.1 |  |  |  | (0.4 | ) |  |  | 10.7 |
Other securities |  |  | (a | ) |  |  | 4.1 |  |  |  | (0.1 | ) |  |  | 12.4 |  |  |  | (0.1 | ) |  |  | 16.5 |
Total available for sale investments |  | $ | (17.7 | ) |  | $ | 895.3 |  |  | $ | (10.7 | ) |  | $ | 434.6 |  |  | $ | (28.4 | ) |  | $ | 1,329.9 |
(a) | These investments have been in an unrealized loss position; however, the amount of unrealized loss is less than $0.05.
Schedule of Amortized Cost and Fair Value of Investment Securities Available for Sale by Contractual Maturity | The amortized cost and fair value of investment securities available for sale at June 30, 2018, by contractual maturity are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or to prepay obligations with or without call or prepayment penalties.
|  | June 30, 2018 |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 2,339.5 |  |  | $ | 2,339.3 |
Due in one to three years |  |  | 475.5 |  |  |  | 469.9 |
Due in three to five years |  |  | 588.1 |  |  |  | 580.8 |
Due after five years |  |  | 319.1 |  |  |  | 307.8 |
Invested customer trust funds |  | $ | 3,722.2 |  |  | $ | 3,697.8 |

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