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Organization - Use of the Proceeds from the IP (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
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Gross proceeds | $ 631.3 |  |  |  |
Underwriters' discounts and commissions | 29.2 |  |  |  |
IPO-related expenses | 11.8 |  |  |  |
Redemption of 11% Senior Notes due 2021 (Note 8) | 1,132.3 | $ 25.9 | $ 25.9 | $ 11.8 | $ 7.0
Sponsor management termination fee | 11.3 |  |  |  |
Debt refinancing expenses | 11.4 |  |  |  |
Cash to balance sheet | 68.6 |  |  |  |
Senior Notes [Member] | 11% Senior Note [Member] |  |  |  |  |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Redemption of 11% Senior Notes due 2021 (Note 8) | 475.0 |  |  |  |
Call premium on redemption of 11% Senior Notes due 2021 | 13.1 |  |  |  |
Interest on redemption of 11% Senior Notes due 2021 | $ 10.9 |  |  |  |

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