Financial Data by Segment and Geographic Area - Schedule of Revenue by Solutions (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 179.6	$ 163.5	$ 546.1	$ 488.4
HCM [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	179.6	163.5	546.1	488.4
HCM [Member] | Cloud Revenue [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	133.0	103.0	386.0	288.0
HCM [Member] | Bureau Revenue [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 46.6	$ 60.5	$ 160.1	$ 200.4