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Net Income (Loss) per Share - Schedule of Numerators and Denominators of Basic and Diluted Net Income (Loss) per Share Computations (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income attributable to Ceridian $ 11.2 $ 0.6
Less: Loss from discontinued operations   (2.1)
Net income from continuing operations attributable to Ceridian 11.2 2.7
Less: Senior Preferred Stock dividends declared   5.3
Net income (loss) from continuing operations attributable to Ceridian available to common stockholders $ 11.2 $ (2.6)
Denominator:    
Weighted-average shares outstanding - basic 140,149,271 65,314,462
Effect of dilutive equity instruments 6,892,957  
Weighted-average shares outstanding - diluted 147,042,228 65,314,462
Net income (loss) per share from continuing operations attributable to Ceridian - basic $ 0.08 $ (0.04)
Net loss per share from discontinued operations - basic   (0.03)
Net income (loss) per share attributable to Ceridian - basic 0.08 (0.07)
Net income (loss) per share from continuing operations attributable to Ceridian - diluted 0.08 (0.04)
Net loss per share from discontinued operations - diluted   (0.03)
Net income (loss) per share attributable to Ceridian - diluted $ 0.08 $ (0.07)