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Schedule III - SCHEDULE OF REAL ESTATE AND ACCUMULATED DEPRECIATION
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]  
Schedule III - Schedule of Real Estate and Accumulated Depreciation
SCHEDULE III—SCHEDULE OF REAL ESTATE
AND ACCUMULATED DEPRECIATION
(dollars in millions)

Description
 
Encumbrances
 
 
Initial cost
to company
 
Cost
capitalized
subsequent to
acquisition
 
Gross amount
carried at
close of current
period
 
 
Accumulated
depreciation at close of current period
 
Date of
construction
 
Date
acquired
 
Life on which
depreciation in
latest income
statements is
computed
177,746
Sites (1)
 
$
2,736.5

(2)
 
(3)
 
(3)
 
$
17,429.3

(4)
 
$
(6,382.2
)
 
Various
 
Various
 
Up to 20 years
_______________
(1)    No single site exceeds 5% of the total amounts indicated in the table above.
(2)    Certain assets secure debt of $2.7 billion.
(3)    The Company has omitted this information, as it would be impracticable to compile such information on a site-by-site basis.
(4)    Does not include those sites under construction.
 
2019
 
2018
 
2017
Gross amount at beginning
$
15,960.1

 
$
15,349.0


$
14,277.0

Additions during period:
 
 
 
 
 
Acquisitions
887.0

 
721.4

 
499.7

Discretionary capital projects (1)
258.1

 
173.5

 
120.7

Discretionary ground lease purchases (2)
189.8

 
180.4

 
150.4

Redevelopment capital expenditures (3)
213.6

 
177.3

 
138.8

Capital improvements (4)
161.2

 
94.0

 
65.6

Start-up capital expenditures (5)
71.3

 
113.1

 
158.1

Other (6)
45.2

 
(3.0
)
 
106.4

Total additions
1,826.2

 
1,456.7

 
1,239.7

Deductions during period:
 
 
 
 
 
Cost of real estate sold or disposed
(304.6
)
 
(395.7
)
 
(246.5
)
Other (7)
(52.4
)
 
(449.9
)
 
78.8

Total deductions:
(357.0
)
 
(845.6
)
 
(167.7
)
Balance at end
$
17,429.3

 
$
15,960.1

 
$
15,349.0



 
2019
 
2018
 
2017
Gross amount of accumulated depreciation at beginning
$
(5,724.7
)
 
$
(5,181.2
)
 
$
(4,548.1
)
Additions during period:
 
 
 
 
 
Depreciation
(768.4
)
 
(751.4
)
 
(718.7
)
Other
—

 
—

 
—

Total additions
(768.4
)
 
(751.4
)
 
(718.7
)
Deductions during period:
 
 
 
 
 
Amount of accumulated depreciation for assets sold or disposed
121.4

 
129.3

 
100.7

Other (7)
(10.5
)
 
78.6

 
(15.1
)
Total deductions
110.9

 
207.9

 
85.6

Balance at end
$
(6,382.2
)
 
$
(5,724.7
)
 
$
(5,181.2
)

_______________
(1)
Includes amounts incurred primarily for the construction of new sites.
(2)
Includes amounts incurred to purchase or otherwise secure the land under communications sites.
(3)
Includes amounts incurred to increase the capacity of existing sites, which results in new incremental tenant revenue.
(4)
Includes amounts incurred to enhance existing sites by adding additional functionality, capacity or general asset improvements.
(5)
Includes amounts incurred in connection with acquisitions or new market launches. Start-up capital expenditures includes non-recurring expenditures contemplated in acquisitions, new market launch business cases or initial deployment of new technologies or innovation solutions that lead to an increase in site-level cash flow generation.
(6)
Primarily includes regional improvements and other additions.
(7)
Primarily includes foreign currency exchange rate fluctuations and other deductions.