XML 141 R54.htm IDEA: XBRL DOCUMENT v3.20.4
Acquisitions - Narratives (Details) - Aero Communications, Inc. [Member] - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2018
Jan. 25, 2020
Business Acquisition [Line Items]    
Payment to acquire business, net of cash acquired $ 20.9  
Business Combination, Purchase Accounting Adjustment to Receivables   $ 0.5