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Summary of Significant Accounting Policies - Impact of Adoption of ASC 606 on Revenue (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Recurring services | $ 156.6 | $ 140.8 | $ 323.6 | $ 292.6
Professional services and other | 22.7 | 16.7 | 42.9 | 32.3
Total revenue | 179.3 | 157.5 | 366.5 | 324.9
Operating (loss) profit | (11.3) | 0.9 | 16.0 | 11.8
Accounting Standards Update 2014-09 [Member] |  |  |  |
Recurring services | 151.3 | 134.3 | 310.7 | 280.2
Professional services and other | 28.4 | 23.8 | 57.4 | 46.1
Total revenue | 179.7 | 158.1 | 368.1 | 326.3
Operating (loss) profit | (8.1) | 3.5 | 22.3 | 16.6
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Recurring services | (5.3) | (6.5) | (12.9) | (12.4)
Professional services and other | 5.7 | 7.1 | 14.5 | 13.8
Total revenue | 0.4 | 0.6 | 1.6 | 1.4
Operating (loss) profit | $ 3.2 | $ 2.6 | $ 6.3 | $ 4.8

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