Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011
Acquisitions
Towers acquired (properties)	140	306
Antenna sites acquired	1	2
Aggregate consideration paid for acquisition	$ 68.6	$ 151.7
Long-term lease extensions	2.7	3.9
Cash paid for land and perpetual easement purchases	7.1	14.3
Finite lived intangible asset (years)		15
Contingent consideration	1.1	2.5
Potential obligations to pay additional consideration	6.8	6.8
Default consideration		$ 3.5

Antenna Sites Acquired

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Business Acquisition Contingent Consideration Paid

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Long Term Lease Extensions

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Towers Acquired

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Amount of potential cash payments that could result from the contingent consideration arrangement.

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The useful life of all finite-lived intangible assets.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

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