Quarterly report pursuant to Section 13 or 15(d)

Business and Credit Concentrations - Additional Information (Detail)

v3.10.0.1
Business and Credit Concentrations - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Customer
Sep. 30, 2017
USD ($)
Customer
Sep. 30, 2018
USD ($)
Customer
Sep. 30, 2017
USD ($)
Customer
Dec. 31, 2017
USD ($)
Customer
Concentration Risk [Line Items]          
Credit losses attributable to write-offs | $ $ 2.2 $ 5.7 $ 6.4 $ 7.9  
Net Sales [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Number of largest customers | Customer 5 5 5 5  
Percentage of concentration risk 10.60% 11.40% 10.50% 12.50%  
Number of customers accounting for more than 10% | Customer 0 0 0 0  
Net Trade Receivable [Member] | Credit Concentration Risk [Member]          
Concentration Risk [Line Items]          
Number of largest customers | Customer         1
Percentage of concentration risk         10.60%
Number of customers accounting for more than 10% | Customer     0   0
Domestic [Member]          
Concentration Risk [Line Items]          
Accounts receivable | $ $ 204.2   $ 204.2   $ 206.1
Non-US [Member]          
Concentration Risk [Line Items]          
Accounts receivable | $ 325.3   325.3   251.0
Net total assets held outside the United States | $ $ 1,443.0   $ 1,443.0   $ 1,273.0