Concentration of Credit Risk (Summary of Significant Customers and Percentage of Total Revenue for Specified Time Periods Derived from Such Customers) (Details) - Revenue [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
T-Mobile [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	36.20%	34.50%	35.10%
AT&T Wireless [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	22.20%	24.10%	23.80%
Verizon Wireless [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.70%	14.10%	14.00%
Domestic Site Leasing [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	91.00%
Domestic Site Leasing [Member] | T-Mobile [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	40.20%	40.50%	40.60%
Domestic Site Leasing [Member] | AT&T Wireless [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	30.50%	32.20%	32.10%
Domestic Site Leasing [Member] | Verizon Wireless [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	19.80%	18.50%	18.60%
International Site Leasing [Member] | Oi S.A. [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	28.30%	28.70%	31.30%
International Site Leasing [Member] | Telefonica [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	16.30%	18.10%	26.90%
International Site Leasing [Member] | Claro [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	13.70%	14.50%	11.60%
Site Development Revenue [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	9.00%
Site Development Revenue [Member] | T-Mobile [Member] | Segment Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage	78.20%	66.80%	67.50%