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Net (Loss) Income per Share - Schedule of Computations of Basic and Diluted Net (Loss) Income per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net (loss) income attributable to Ceridian $ (4.0) $ 78.7 $ (60.6)
Less: Loss from discontinued operations     (25.8)
Net (loss) income from continuing operations attributable to Ceridian (4.0) 78.7 (34.8)
Less: Senior Preferred Stock dividends declared     7.7
Net (loss) income from continuing operations attributable to Ceridian available to common stockholders $ (4.0) $ 78.7 $ (42.5)
Denominator:      
Weighted-average shares outstanding—basic 146,774,471 142,049,112 114,049,682
Effect of dilutive equity instruments   6,707,480  
Weighted-average shares outstanding—diluted 146,774,471 148,756,592 114,049,682
Net (loss) income per share from continuing operations attributable to Ceridian—basic $ (0.03) $ 0.55 $ (0.37)
Net loss per share from discontinued operations—basic     (0.23)
Net (loss) income per share attributable to Ceridian—basic (0.03) 0.55 (0.60)
Net (loss) income per share from continuing operations attributable to Ceridian—diluted (0.03) 0.53 (0.37)
Net loss per share from discontinued operations—diluted     (0.23)
Net (loss) income per share attributable to Ceridian—diluted $ (0.03) $ 0.53 $ (0.60)