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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2017 | Mar. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Apr. 30, 2018 | Oct. 01, 2013
Capital Unit [Line Items] |  |  |  |  |  |  |
Common Stock, authorized shares |  | 150,000,000 | 150,000,000 | 150,000,000 | 500,000,000 |  | 100,000,000
Common Stock, par value |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01
Common Stock, shares issued |  |  | 65,285,962 | 65,001,037 | 138,049,718 | 24,150,000 |
Common Stock, shares outstanding |  |  | 65,285,962 | 65,001,037 | 138,049,718 |  |
Voting right of common stock |  |  | One vote |  |  |  |
Stock issued in equity financing |  |  | $ 3.2 | $ 75.0 |  |  |
Receivable from stockholders |  |  |  | $ 75.2 |  |  |
Junior Preferred Stock [Member] |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Preferred Stock, shares authorized |  |  | 70,000,000 | 70,000,000 |  |  | 70,000,000
Preferred Stock, par value |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01
Preferred Stock, shares issued |  |  | 58,244,308 | 58,244,308 |  |  |
Preferred Stock, shares outstanding |  |  | 58,244,308 | 58,244,308 |  |  |
Junior Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Preferred stock liquidation preference |  |  | $ 6.75 |  |  |  |
Senior Preferred Stock [Member] |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Preferred Stock, shares authorized |  | 70,000,000 | 70,000,000 | 70,000,000 |  |  |
Preferred Stock, par value |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |
Preferred Stock, shares issued |  |  | 16,802,144 | 16,802,144 |  |  |
Preferred Stock, shares outstanding |  |  | 16,802,144 | 16,802,144 |  |  |
Stock issued in equity financing |  | $ 150.2 |  | $ 150.2 |  |  |
Receivable from stockholders |  | 75.2 |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 12.50% |  |  |  |
Preferred stock, liquidation preference |  |  | In the event of liquidation, the Senior Preferred Stock has a liquidation preference equal to 1.5 times the initial face amount plus any accrued but unpaid dividends. |  |  |  |
Senior Preferred Stock [Member] | Ceridian Holding II [Member] |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Equity contributed by stockholders | $ 75.2 | $ 75.0 |  |  |  |  |

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