Goodwill | Customer related | Technology and trading related | Development costs | Software | Total | ||||||||||||||
$M | $M | $M | $M | $M | $M | ||||||||||||||
Cost: | |||||||||||||||||||
At January 1, 2016 | 83.4 | 13.4 | 9.3 | 4.0 | 3.5 | 113.6 | |||||||||||||
Additions | 0.1 | 0.1 | — | 2.4 | 0.1 | 2.7 | |||||||||||||
Disposals | — | — | — | — | (0.6 | ) | (0.6 | ) | |||||||||||
Exchange difference | (8.2 | ) | — | (1.3 | ) | (0.4 | ) | (0.3 | ) | (10.2 | ) | ||||||||
At December 31, 2016 | 75.3 | 13.5 | 8.0 | 6.0 | 2.7 | 105.5 | |||||||||||||
Additions | — | — | — | 0.9 | 0.8 | 1.7 | |||||||||||||
Disposals | — | (0.1 | ) | — | — | (0.4 | ) | (0.5 | ) | ||||||||||
Exchange difference | 4.1 | — | 0.6 | 0.5 | 0.3 | 5.5 | |||||||||||||
At December 31, 2017 | 79.4 | 13.4 | 8.6 | 7.4 | 3.4 | 112.2 | |||||||||||||
Accumulated amortization and impairment: | |||||||||||||||||||
At January 1, 2016 | 21.2 | 1.5 | 1.8 | 0.1 | 2.0 | 26.6 | |||||||||||||
Provided during the year | — | 0.7 | 0.4 | 0.3 | 0.3 | 1.7 | |||||||||||||
Disposals | — | — | — | — | (0.3 | ) | (0.3 | ) | |||||||||||
Exchange difference | (2.8 | ) | (0.1 | ) | (0.3 | ) | 0.1 | — | (3.1 | ) | |||||||||
At December 31, 2016 | 18.4 | 2.1 | 1.9 | 0.5 | 2.0 | 24.9 | |||||||||||||
Provided during the year | — | 0.9 | 0.4 | 0.7 | 0.3 | 2.3 | |||||||||||||
Disposals | — | (0.1 | ) | — | — | (0.4 | ) | (0.5 | ) | ||||||||||
Impairment | — | — | 0.5 | 1.5 | — | 2.0 | |||||||||||||
Exchange difference | 1.4 | — | 0.2 | 0.1 | 0.1 | 1.8 | |||||||||||||
At December 31, 2017 | 19.8 | 2.9 | 3.0 | 2.8 | 2.0 | 30.5 | |||||||||||||
Net book values: | |||||||||||||||||||
At December 31, 2017 | 59.6 | 10.5 | 5.6 | 4.6 | 1.4 | 81.7 | |||||||||||||
At December 31, 2016 | 56.9 | 11.4 | 6.1 | 5.5 | 0.7 | 80.6 | |||||||||||||
At January 1, 2016 | 62.2 | 11.9 | 7.5 | 3.9 | 1.5 | 87.0 | |||||||||||||