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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Contract with Customer, Asset and Liability
Contract assets and liabilities consisted of the following:
 
December 31
 
 
 
In millions
2019
2018
 
$ Change
% Change
Contract assets
$
41.0

$
36.5

 
$
4.5

12.3
 %
Contract liabilities
32.6

32.8

 
(0.2
)
(0.6
)%
Net contract assets
$
8.4

$
3.7

 
$
4.7

127.0
 %

Disaggregation of Revenue
Geographic net sales information for continuing operations, based on geographic destination of the sale, was as follows:
 
Years ended December 31
In millions
2019
2018
2017
U.S.
$
1,866.7

$
1,858.1

$
1,752.7

Western Europe
401.6

402.7

381.9

Developing (1)
480.6

476.5

478.2

Other Developed (2)
208.3

227.8

232.9

Consolidated net sales (3)
$
2,957.2

$
2,965.1

$
2,845.7

(1)  Developing includes China, Eastern Europe, Latin America, the Middle East and Southeast Asia.
(2) Other Developed includes Australia, Canada and Japan.
(3) Net sales held in Ireland, for each of the years presented, were not material.

Vertical net sales information was as follows:
 
Years ended December 31
In millions
2019
2018
2017
Residential
$
1,668.2

$
1,665.9

$
1,579.0

Commercial
627.3

630.7

604.4

Industrial
661.7

668.5

662.3

Consolidated net sales
$
2,957.2

$
2,965.1

$
2,845.7


Allowance for Doubtful Accounts Activity
The following table summarizes the activity in the allowance for doubtful accounts:
 
Years ended December 31
In millions
2019
2018
2017
Beginning balance
$
14.0

$
14.2

$
12.8

Bad debt expense
1.4

1.1

2.3

Write-offs, net of recoveries
(4.1
)
(0.9
)
(2.2
)
Other (1)
(1.0
)
(0.4
)
1.3

Ending balance
$
10.3

$
14.0

$
14.2

(1) Other amounts are primarily the effects of changes in currency translations and the impact of allowance for credits.

Property, Plant and Equipment
Property, plant and equipment, net
Property, plant and equipment is stated at historical cost. We compute depreciation by the straight-line method based on the following estimated useful lives:
 
Years
Land improvements
5 to 20
Buildings and leasehold improvements
5 to 50
Machinery and equipment
3 to 15

Long-lived Assets by Geographic Areas
The following table presents geographic Property, plant and equipment, net by region as of December 31:
In millions
2019
2018
U.S.
$
172.3

$
156.9

Western Europe
69.7

76.6

Developing (1)
31.1

28.8

Other Developed (2)
10.1

10.3

Consolidated (3)
$
283.2

$
272.6

(1)  Developing includes China, Eastern Europe, Latin America, the Middle East and Southeast Asia.
(2) Other Developed includes Australia, Canada and Japan.
(3) Property, plant and equipment, net held in Ireland, for each of the years presented, were not material.