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Income Taxes - Provision for Income Taxes (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
(Loss) Income Before Income Taxes: |  |  |  |  |
U.S. |  |  | $ (83.4) | $ (163.4) | $ (147.3)
International |  |  | 29.3 | 64.8 | 43.2
Total |  |  | (54.1) | (98.6) | (104.1)
Current: |  |  |  |  |
U.S. |  |  | (0.3) | (0.4) | (0.2)
State and local |  |  | 0.1 | 0.2 | 0.1
International |  |  | 12.9 | 15.2 | 15.1
Total current income tax expense |  |  | 12.7 | 15.0 | 15.0
Deferred: |  |  |  |  |
U.S. |  |  | (60.3) | (15.7) | (10.4)
State and local |  |  | 0.8 | (0.1) | (1.8)
International |  |  | (2.8) | 7.5 | 1.5
Total deferred income tax (benefit) expense | $ (9.8) | $ (4.4) | (62.3) | (8.3) | (10.7)
Total income tax (benefit) expense | $ 5.8 | $ 3.8 | $ (49.6) | $ 6.7 | $ 4.3

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