Basis of Presentation and Summary of Significant Accounting Policies Radio Conversion Costs (Details) - USD ($)	3 Months Ended		12 Months Ended	48 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2022
Subsequent Event [Line Items]
Communications and Information Technology	$ 16,000,000	$ 0
ADT Radio Conversion Revenue	$ 9,000,000
Forecast [Member] | Minimum
Subsequent Event [Line Items]
Radio Conversion Cost			$ 50,000,000	$ 200,000,000
Forecast [Member] | Maximum
Subsequent Event [Line Items]
Radio Conversion Cost			$ 100,000,000	$ 325,000,000