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Summary of Significant Accounting Policies - Impact of Adoption of ASC 606 on Revenue (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Recurring services | $ 480.8 | $ 438.2 | $ 598.5 | $ 558.5 | $ 559.3
Professional services and other | 65.3 | 50.2 | 72.3 | 64.9 | 52.3
Total revenue | 546.1 | 488.4 | 670.8 | 623.4 | 611.6
Operating profit (loss) | 31.3 | 16.9 | $ 33.0 | $ (11.2) | $ (16.3)
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Recurring services | 460.4 | 419.8 |  |  |
Professional services and other | 85.5 | 72.7 |  |  |
Total revenue | 545.9 | 492.5 |  |  |
Operating profit (loss) | 36.9 | 25.7 |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |
Recurring services | (20.4) | (18.4) |  |  |
Professional services and other | 20.2 | 22.5 |  |  |
Total revenue | (0.2) | 4.1 |  |  |
Operating profit (loss) | $ 5.6 | $ 8.8 |  |  |

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