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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective income tax percentage   21.00%     35.00% 35.00% 35.00%
Statutory tax rate, including state and local taxes   25.90%     39.00%    
Income tax expense   $ 5.8 $ 3.8   $ (49.6) $ 6.7 $ 4.3
Unrecognized tax benefits $ 1.3 1.3     1.5    
Accrued Interest included in unrecognized tax benefits 0.2 0.2     0.4    
Unrecognized tax benefits if recognized would impact on effective income tax rate 1.3 $ 1.3          
Income tax examination description   With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2014.          
Tax benefit recognized from consolidation of financial statement         59.4    
Decrease of the net deferred tax asset and the recognition of a tax expense         28.0    
Recognition of tax benefit due to revaluation of valuation allowance         54.4    
Untaxed foreign earnings         74.3    
Tax expense         26.0    
Foreign earnings resulting in a tax benefit         26.0    
Deferred tax liability, tax benefit         20.9    
Increase of the valuation allowance and a tax expense         $ 20.9    
Tax Credit Carryforward, Description         The Tax Act changes the current 20-year carryover period for a net operating loss ("NOL") to an indefinite carryover period for NOL's incurred after December 31, 2017.    
Net federal tax benefit, available from the loss carryovers         $ 70.5    
Federal tax credit carryovers         0.3    
State tax credit carryovers benefit         29.7    
Federal net operating loss tax benefit, amount         1.0    
Valuation allowance         90.7 $ 159.9  
Accrued interest and penalty         $ 0.4    
Amount of unrecognized tax benefits         Of the total amount of unrecognized tax benefits, $1.5 represents the amount that, if recognized, would impact our effective income tax rate as of December 31, 2017.    
Overseas earnings available for reinvestment         $ 234.5    
Deferred tax liability for the expected tax cost of repatriating such earnings         5.1    
Valuation Allowance [Member]              
Decrease of the valuation allowance and a tax expense         $ 33.0    
Scenario, Plan [Member]              
Effective income tax percentage       21.00%      
Research Tax Credit Carryforward [Member]              
Tax credit carryforward, expiration date         Dec. 31, 2027    
Tax Cutsand Jobs Actof 2017 [Member]              
Income tax expense 0.0            
Increase in includible untaxed foreign earnings 16.2            
Tax benefit utilaization 16.2            
Tax Cutsand Jobs Actof 2017 [Member] | Foreign Income [Member]              
Income tax expense 5.7            
Tax Cutsand Jobs Actof 2017 [Member] | Operating Loss Carryforwards [Member]              
Income tax expense $ (5.7)            
Earliest Tax Year [Member]              
Tax credit carryforward, expiration date         Dec. 31, 2021    
Latest Tax Year [Member]              
Tax credit carryforward, expiration date         Dec. 31, 2029    
Previously Reported [Member]              
Unrecognized tax benefits         $ 1.5