Goodwill and Intangible Assets and Liabilities - Schedule of Carrying Value of the Intangible Assets and Liabilities (Details) - USD ($) $ in Millions		9 Months Ended
	Aug. 02, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Finite life intangible assets, original cost		$ 1,545.0		$ 479.1
Finite life intangible assets, accumulated amortization		(271.5)		(203.7)
Total		1,273.5		275.4
Below-market leases, Original Cost		15.2		191.2
Below-market leases, Accumulated Amortization		(9.5)		(45.5)
Total		5.7		145.7
Cash proceeds	$ 3.1	3.1	$ 0.0
Customer relationships
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Finite life intangible assets, original cost		750.0		0.0
Finite life intangible assets, accumulated amortization		(41.9)		0.0
Total		708.1		0.0
Customer lists
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Finite life intangible assets, original cost		416.1		416.1
Finite life intangible assets, accumulated amortization		(191.4)		(174.3)
Total		224.7		241.8
IPv4 addresses
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Finite life intangible assets, original cost		162.8		0.0
Finite life intangible assets, accumulated amortization		(1.6)		0.0
Total	$ 2.8	161.2		0.0
Trade name
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Finite life intangible assets, original cost		115.0		0.0
Finite life intangible assets, accumulated amortization		(1.3)		0.0
Total		113.7		0.0
Contracts
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Finite life intangible assets, original cost		52.5		52.5
Finite life intangible assets, accumulated amortization		(32.8)		(27.9)
Total		19.7		24.6
Rights of way
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Finite life intangible assets, original cost		48.6		10.5
Finite life intangible assets, accumulated amortization		(2.5)		(1.5)
Total		$ 46.1		$ 9.0