Net (Loss) Income per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Computations of Basic and Diluted Net (Loss) Income per Share

The basic and diluted net (loss) income per share computations were calculated as follows:

	Year Ended December 31,
	2020			2019		2018
	(Dollars in millions, except share and per share data)
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	)

Schedule of Potentially Dilutive Shares Excluded from Calculation of Diluted Net (Loss) Income per Share

The following potentially dilutive shares were excluded from the calculation of diluted net (loss) income per share because their effect would have been anti-dilutive:

	Year Ended December 31,
	2020		2019		2018
Senior convertible preferred stock		—		—		5,523,993
Junior convertible preferred stock		—		—		19,148,814
Term-based stock options		7,135,159		3,307,719		14,227,487
Restricted stock units		745,955		18,980		587,283
Performance stock units		229,433		—		—