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Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]      
Total revenue $ 842.5 $ 824.1 $ 740.7
Cloud Dayforce Recurring Services [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 500.2 429.0 325.7
Cloud Dayforce Professional Services and Other [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 148.6 140.7 111.8
Cloud Dayforce Revenue [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 648.8 569.7 437.5
Cloud Powerpay Recurring Services [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 79.5 89.0 90.0
Cloud Powerpay Professional Services and Other [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 1.1 1.3 1.3
Cloud Powerpay Revenue [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 80.6 90.3 91.3
Cloud Revenue [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 729.4 660.0 528.8
Bureau Recurring Services Revenue [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 110.5 162.1 209.3
Bureau Professional Services and Other Revenue [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue 2.6 2.0 2.6
Bureau Revenue [Member]      
Disaggregation Of Revenue [Line Items]      
Total revenue $ 113.1 $ 164.1 $ 211.9