Acquisitions (Narrative) (Details) $ in Millions		2 Months Ended	12 Months Ended
	Jan. 04, 2022 USD ($) item	Mar. 01, 2022 USD ($) item	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item
Business Acquisition [Line Items]
Number of towers acquired | item			991	233	2,443
Performance targets, maximum potential obligation			$ 11.6	$ 35.0
Exclusive Right to Lease and Operate Utility Transmission Structures [Member]
Business Acquisition [Line Items]
Consideration transferred			$ 972.0
Other Acquisitions [Member]
Business Acquisition [Line Items]
Number of towers acquired | item			278	233	2,443
Property and equipment			$ 26.1	$ 30.1	$ 90.8
Intangible assets			135.8	218.1	715.5
Operating leases right-of-use assets, net			18.6
Other net assets and liabilities assumed			$ 0.8	$ 66.8	$ 32.8
Subsequent Event [Member]
Business Acquisition [Line Items]
Consideration transferred		$ 137.1
Number of communication sites acquired | item		371
Subsequent Event [Member] | Airtel Tanzania [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 176.1
Number of communication sites acquired | item	1,445
Subsequent Event [Member] | Airtel Tanzania [Member] | Legal Title Fully Transferred [Member]
Business Acquisition [Line Items]
Number of communication sites acquired | item	963
Subsequent Event [Member] | Airtel Tanzania [Member] | Initially Recorded in Acquired and Other Right-of-use Assets, Net [Member]
Business Acquisition [Line Items]
Number of communication sites acquired | item	482