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Goodwill and Intangible Assets - Schedule of Other Intangible Asset (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 536.9 | $ 539.8 | $ 532.3
Accumulated Amortization | (344.6) | (333.3) | (308.6)
Net | 192.3 | 206.5 | 223.7
Customer Lists and Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 208.6 | 210.1 | 206.2
Accumulated Amortization | (188.8) | (177.0) | (156.6)
Net | $ 19.8 | $ 33.1 | $ 49.6
Customer Lists and Relationships [Member] | Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Life Range (Years) | 5 years | 5 years | 5 years
Customer Lists and Relationships [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Life Range (Years) | 15 years | 15 years | 15 years
Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 173.9 | $ 174.1 | $ 173.6
Accumulated Amortization | (2.0) | (2.1) | (1.9)
Net | 171.9 | 172.0 | 171.7
Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 154.4 | 155.6 | 152.5
Accumulated Amortization | (153.8) | (154.2) | (150.1)
Net | $ 0.6 | $ 1.4 | $ 2.4
Technology [Member] | Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Life Range (Years) | 2 years | 2 years | 2 years
Technology [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated Life Range (Years) | 7 years | 7 years | 7 years

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