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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