Description of Business and Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) Customer	Sep. 30, 2019	Sep. 30, 2020 USD ($) Customer	Sep. 30, 2019	Dec. 31, 2019 Customer
Description Of Business And Accounting Policies [Line Items]
Number of customers, exceeds 10% of total accounts receivable | Customer	1		1		1
Revenue derived from foreign operations	5.00%	5.00%	5.00%	5.00%
Deferred tax assets, valuation allowance released			$ 15.3
Tax effect of nondeductible transaction costs			7.6
Released amount of sales and use tax reserve	$ 0.3		$ 4.7
Verizon Communications Inc. [Member]
Description Of Business And Accounting Policies [Line Items]
Accounts receivable from one customer greater than 10%, percentage	11.00%		11.00%		25.00%