Quarterly report pursuant to Section 13 or 15(d)

Business and Credit Concentrations - Additional Information (Detail)

v3.20.2
Business and Credit Concentrations - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Customer
Sep. 30, 2019
USD ($)
Customer
Sep. 30, 2020
USD ($)
Customer
Sep. 30, 2019
USD ($)
Customer
Dec. 31, 2019
USD ($)
Concentration Risk [Line Items]          
Credit losses attributable to write-offs $ 0.9 $ 1.6 $ 3.8 $ 5.7  
Sales [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Number of largest customers | Customer 5 5 5 5  
Percentage of concentration risk 8.80% 9.40% 8.90% 9.70%  
Domestic [Member]          
Concentration Risk [Line Items]          
Accounts receivable $ 264.3   $ 264.3   $ 228.5
Non-US [Member]          
Concentration Risk [Line Items]          
Accounts receivable 486.4   486.4   440.9
Net total assets held outside the United States $ 3,036.4   $ 3,036.4   $ 2,643.8