Quarterly report pursuant to Section 13 or 15(d)

Business and Credit Concentrations - Additional Information (Detail)

v3.8.0.1
Business and Credit Concentrations - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
Customer
Mar. 31, 2017
USD ($)
Customer
Dec. 31, 2017
USD ($)
Concentration Risk [Line Items]      
Credit losses attributable to write-offs $ 2.0 $ 0.1  
Net Sales [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Number of largest customers | Customer 5 5  
Percentage of concentration risk 10.80% 13.20%  
Number of customers accounting for more than 10% | Customer 0 0  
Net Trade Receivable [Member] | Credit Concentration Risk [Member]      
Concentration Risk [Line Items]      
Number of customers accounting for more than 10% | Customer 0 0  
Domestic [Member]      
Concentration Risk [Line Items]      
Accounts receivable $ 317.8   $ 206.1
Non-US [Member]      
Concentration Risk [Line Items]      
Accounts receivable 394.6   251.0
Net total assets held outside the United States $ 1,364.0   $ 1,273.0