Table:
|  | Net Unrealized Gains (Losses) on Derivative Instruments | Net Unrealized Gains (Losses) on Available for Sale Securities | Defined Benefit Pension Components | Foreign Currency Translation Adjustments | Total |
| --- | --- | --- | --- | --- | --- |
| Balances, January 31, 2017 | $14.6 | $1.5 | $(33.8) | $(160.8) | $(178.5) |
| Other comprehensive (loss) income before reclassifications | (24.5) | (0.6) | 4.3 | 86.3 | 65.5 |
| Pre-tax losses (gains) reclassified from accumulated other comprehensive income | (9.9) | 0.3 | 0.9 | 0.1 | (8.6) |
| Tax effects | 3.2 | 0.1 | (0.7) | (4.8) | (2.2) |
| Net current period other comprehensive (loss) income | (31.2) | (0.2) | 4.5 | 81.6 | 54.7 |
| Balances, January 31, 2018 | (16.6) | 1.3 | (29.3) | (79.2) | (123.8) |
| Other comprehensive income (loss) before reclassifications | 20.6 | 0.7 | 14.7 | (58.3) | (22.3) |
| Pre-tax gains reclassified from accumulated other comprehensive income | 12.1 | 1.3 | 0.3 | — | 13.7 |
| Tax effects | (1.1) | — | (2.0) | 0.5 | (2.6) |
| Net current period other comprehensive income (loss) | 31.6 | 2.0 | 13.0 | (57.8) | (11.2) |
| Balances, January 31, 2019 | $15.0 | $3.3 | $(16.3) | $(137.0) | $(135.0) |
Paragraphs:
12. Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss, net of taxes, consisted of the following:
Reclassifications related to gains and losses on available-for-sale debt securities are included in "Interest and other expense, net". Refer to Note 3, "Financial Instruments" for the amount and location of reclassifications related to derivative instruments. Reclassifications of the defined benefit pension components of net periodic benefit cost are included in "Interest and other expense, net". Refer to Note 15, "Retirement Benefit Plans."
Question:
What is the average total balance from 2017 to 2019?
Answer: (178.5+123.8+135.0)/3  = 145.77