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Discontinued Operations - Supplemental Disclosure of Discontinued Operation (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
(Loss) income from discontinued operations, net of income taxes | $ (14.8) | $ (2.4) | $ (6.0) | $ 12.5 | $ 3.7
LifeWorks [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net revenues | 28.3 | 59.9 | 79.9 | 80.8 | 82.3
Income (loss) from operations before income taxes | (0.9) | 1.9 | (0.4) | 7.1 | 23.8
Income tax benefit (expense) | (13.9) | (3.9) | (4.9) | (11.1) | (4.3)
(Loss) income from discontinued operations, net of income taxes | (14.8) | (2.0) | (5.3) | (4.0) | 19.5
Depreciation and amortization | $ 1.4 | 3.0 | 4.1 | 4.1 | 3.8
Capital expenditures |  | 0.2 | 0.2 | 0.3 | 0.4
UK Business [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net revenues |  |  |  | 37.0 | 79.2
Income (loss) from operations before income taxes |  |  |  | 0.5 | 2.3
(Loss) gain on sale of businesses |  | (0.7) | (1.0) | 5.9 |
Income tax benefit (expense) |  |  |  | 0.2 | (1.4)
(Loss) income from discontinued operations, net of income taxes |  | (0.7) | (1.0) | 6.6 | 0.9
Depreciation and amortization |  |  |  | 1.3 | 3.3
Capital expenditures |  |  |  | 0.7 | 2.4
Divested Benefits Continuation Businesses [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net revenues |  |  |  | 4.8 | 40.0
Income (loss) from operations before income taxes |  |  |  | (0.8) | 12.2
(Loss) gain on sale of businesses |  | 0.5 | 0.5 | 21.0 | (28.9)
Income tax benefit (expense) |  | (0.2) | (0.2) | (10.3) |
(Loss) income from discontinued operations, net of income taxes |  | $ 0.3 | $ 0.3 | $ 9.9 | (16.7)
Depreciation and amortization |  |  |  |  | 0.4
Capital expenditures |  |  |  |  | $ 0.5

X
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- Definition Amount of deprecation and amortization expense attributable to property, plant and equipment and intangible assets of discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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