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Customer Trust Fund - Investment of Customer Trust Fund (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Money market securities, investments carried at cost and other cash equivalents, Fair Value	$ 2,027.1	$ 1,348.1
Invested customer trust funds, Fair Value	3,746.2	3,174.9
Trust receivables, Fair Value	13.2	29.2	[1]
Total customer trust funds, Fair Value	3,759.4	3,204.1
Money market securities, investments carried at cost and other cash equivalents, Amortized Cost	2,027.1	1,348.1
Invested customer trust funds, Amortized Cost	3,684.6	3,153.2
Trust receivables, Amortized Cost	13.2	40.4
Total customer trust funds, Amortized Cost	3,697.8	3,193.6
Amortized Cost	1,657.5	1,805.1
Gross Unrealized Gain	61.7	23.4
Gross Unrealized Loss	(0.1)	(1.7)
Fair value	1,719.1	1,826.8
U.S. Government and Agencies Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	494.0	542.4
Gross Unrealized Gain	21.6	7.1
Gross Unrealized Loss	(0.1)	(0.3)
Fair value	515.5	549.2
Canadian and Provincial Government Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	396.4	406.7
Gross Unrealized Gain	15.5	5.4
Gross Unrealized Loss		(0.7)
Fair value	411.9	411.4
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	548.5	562.2
Gross Unrealized Gain	19.4	9.0
Gross Unrealized Loss		(0.3)
Fair value	567.9	570.9
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	192.2	270.0
Gross Unrealized Gain	4.9	1.7
Gross Unrealized Loss		(0.3)
Fair value	197.1	271.4
Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9.9	19.8
Gross Unrealized Gain	0.2	0.2
Gross Unrealized Loss		(0.1)
Fair value	10.1	19.9
Other Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16.5	4.0
Gross Unrealized Gain	0.1
Fair value	$ 16.6	$ 4.0
[1] The fair value of trust receivable as of December 31, 2019, includes a loss of $11.2 million related to unrecovered duplicate payments resulting from the September 26, 2019, isolated service incident. Ceridian was liable for these unrecovered duplicate payments and reimbursed the customer trust for the resulting losses in the first quarter of 2020. Please refer to Note 17, “Commitments and Contingencies,” for further discussion of the September 26, 2019, isolated service incident.

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