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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | $ 1,091.2 | $ 967.2 |
Other comprehensive income (loss) before income taxes and reclassifications | (41.0) | 25.7 | $ (10.0)
Income tax benefit (expense) | 2.3 | 3.6 | 1.9
Sale of UK Business, net of tax |  |  | 25.9
Reclassifications to earnings | 9.0 | 10.1 | 9.9
Other comprehensive income (loss) attributable to Ceridian | (29.7) | 39.4 | 27.7
Ending balance | 1,538.5 | 1,091.2 | 967.2
LifeWorks [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
LifeWorks Disposition | 0.7 |  |
Foreign Currency Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (160.6) | (199.9) | (224.8)
Other comprehensive income (loss) before income taxes and reclassifications | (16.2) | 39.3 | 8.0
Sale of UK Business, net of tax |  |  | 16.9
Other comprehensive income (loss) attributable to Ceridian | (16.2) | 39.3 | 24.9
Ending balance | (176.1) | (160.6) | (199.9)
Foreign Currency Translation Adjustment [Member] | LifeWorks [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
LifeWorks Disposition | 0.7 |  |
Unrealized Gain (Loss) from Invested Customer Trust Funds [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (9.0) | 4.7 | 12.9
Other comprehensive income (loss) before income taxes and reclassifications | (24.5) | (17.3) | (10.2)
Income tax benefit (expense) | 2.3 | 3.6 | 2.0
Other comprehensive income (loss) attributable to Ceridian | (22.2) | (13.7) | (8.2)
Ending balance | (31.2) | (9.0) | 4.7
Pension Liability Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (142.5) | (156.3) | (167.3)
Other comprehensive income (loss) before income taxes and reclassifications | (0.3) | 3.7 | (7.8)
Income tax benefit (expense) |  |  | (0.1)
Sale of UK Business, net of tax |  |  | 9.0
Reclassifications to earnings | 9.0 | 10.1 | 9.9
Other comprehensive income (loss) attributable to Ceridian | 8.7 | 13.8 | 11.0
Ending balance | (133.8) | (142.5) | (156.3)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (312.1) | (351.5) | (379.2)
Ending balance | $ (341.1) | $ (312.1) | $ (351.5)

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