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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