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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Balance | $ 1,961.0 | $ 1,933.1 |
Translation | (11.2) | 27.9 |
Balance | 1,949.8 | 1,961.0 | $ 1,933.1
HCM [Member] |  |  |
Goodwill [Line Items] |  |  |
Balance | $ 1,961.0 | 1,933.1 | 2,008.5
Formation of Joint Venture Company |  |  | (87.7)
Translation |  | 27.9 | 12.3
Balance |  | 1,961.0 | $ 1,933.1
Tax-deductible goodwill |  | $ 12.2 |

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