December 31, | ||||||||||||||||||||||||||||
2017 | 2016 | 2015 | ||||||||||||||||||||||||||
Gross | Accumulated depreciation |
Net | Gross | Accumulated depreciation |
Net | Net | ||||||||||||||||||||||
(In millions of US$) | ||||||||||||||||||||||||||||
Multi-client surveys Marine |
4,677.7 | (3,936.8 | ) | 740.9 | 4,337.6 | (3,598.4 | ) | 739.2 | 809.2 | |||||||||||||||||||
Multi-client surveys Land |
716.5 | (626.1 | ) | 90.4 | 683.4 | (574.7 | ) | 108.7 | 117.9 | |||||||||||||||||||
Development costs capitalized |
432.5 | (228.5 | ) | 204.0 | 384.6 | (183.1 | ) | 201.5 | 199.9 | |||||||||||||||||||
Software |
113.2 | (88.9 | ) | 24.3 | 106.9 | (76.2 | ) | 30.7 | 39.9 | |||||||||||||||||||
Research — Technology |
75.2 | (75.1 | ) | 0.1 | 83.3 | (82.3 | ) | 1.0 | 4.2 | |||||||||||||||||||
Customer relationships |
232.3 | (165.3 | ) | 67.0 | 246.2 | (170.9 | ) | 75.3 | 85.4 | |||||||||||||||||||
Trade names |
44.2 | (31.6 | ) | 12.6 | 43.7 | (31.2 | ) | 12.5 | 12.4 | |||||||||||||||||||
Other intangible assets |
103.4 | (90.5 | ) | 12.9 | 97.9 | (82.1 | ) | 15.8 | 17.8 | |||||||||||||||||||
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Total intangible assets |
6,395.0 | (5,242.8 | ) | 1,152.2 | 5,983.6 | (4,798.9 | ) | 1,184.7 | 1,286.7 | |||||||||||||||||||
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