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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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