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Net Loss per Share - Schedule of Numerators and Denominators of Basic and Diluted Net Loss per Share Computations (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net loss attributable to Ceridian	$ (65.5)	$ (22.9)	$ (67.6)	$ (34.1)
Less: Income from discontinued operations	(9.7)	0.2	(11.8)	0.5
Net loss from continuing operations attributable to Ceridian	(55.8)	(23.1)	(55.8)	(34.6)
Less: Senior Preferred Stock dividends declared	2.4	5.3	7.7	10.0
Net loss from continuing operations attributable to Ceridian available to common stockholders	$ (58.2)	$ (28.4)	$ (63.5)	$ (44.6)
Denominator:
Weighted-average shares outstanding - basic	113,311,107	65,225,104	89,445,371	65,130,383
Weighted-average shares outstanding - diluted	113,311,107	65,225,104	89,445,371	65,130,383
Net loss per share from continuing operations attributable to Ceridian - basic and diluted	$ (0.51)	$ (0.44)	$ (0.71)	$ (0.68)
Net income per share from discontinued operations - basic and diluted	(0.09)	0.01	(0.13)
Net loss per share attributable to Ceridian - basic and diluted	$ (0.60)	$ (0.43)	$ (0.84)	$ (0.68)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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