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Revenue
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
We disaggregate our revenue from contracts with customers by segment, geographic location and vertical, as we believe these best depict how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Refer to Note 14 for revenue disaggregated by segment.

Geographic net sales information, based on geographic destination of the sale, was as follows:
 
Three months ended
 
Six months ended
In millions
June 30,
2019
June 30,
2018
 
June 30,
2019
June 30,
2018
U.S.
$
511.1

$
504.2

 
$
937.1

$
956.6

Western Europe
106.9

103.8

 
211.2

214.1

Developing (1)
129.0

115.4

 
237.9

228.4

Other Developed (2)
52.5

57.2

 
102.2

114.1

Consolidated net sales
$
799.5

$
780.6

 
$
1,488.4

$
1,513.2

(1)  Developing includes China, Eastern Europe, Latin America, the Middle East and Southeast Asia.
(2) Other Developed includes Australia, Canada and Japan.


Vertical net sales information was as follows:
 
Three months ended
 
Six months ended
In millions
June 30,
2019
June 30,
2018
 
June 30,
2019
June 30,
2018
Residential
$
451.0

$
437.5

 
$
834.6

$
849.7

Commercial
170.7

167.8

 
321.4

319.6

Industrial
177.8

175.3

 
332.4

343.9

Consolidated net sales
$
799.5

$
780.6

 
$
1,488.4

$
1,513.2



Performance obligations
On June 30, 2019, we had $59.8 million of remaining performance obligations on contracts with an original expected duration of one year or more. We expect to recognize the majority of our remaining performance obligations on these contracts within the next 12 to 18 months.

Contract assets and liabilities
Contract assets and liabilities consisted of the following:
In millions
June 30,
2019
December 31,
2018
 
$ Change
% Change
Contract assets
$
43.5

$
36.5

 
$
7.0

19.2
 %
Contract liabilities
32.1

32.8

 
(0.7
)
(2.1
)%
Net contract assets
$
11.4

$
3.7

 
$
7.7

208.1
 %

The $7.7 million increase in net contract assets from December 31, 2018 to June 30, 2019 was primarily the result of timing of milestone payments. Approximately 70% of our contract liabilities at December 31, 2018 were recognized in revenue in the first half of 2019. There were no impairment losses recognized on our contract assets for the three months or six months ended June 30, 2019.