Table:
|  | Years Ended December 31, |  |
| --- | --- | --- |
|  | 2019 | 2018 |
| Tax provision (benefit) at federal statutory rate | $ (11.9) | $ 38.3 |
| Permanent differences | 0.3 | 1.5 |
| State tax, net of federal benefit | (7.3) | 6.2 |
| Foreign rate differential | 1.4 | (0.9) |
| Minority interest | 0.2 | (4.6) |
| Executive and stock compensation | 2.5 | 3.5 |
| Increase (decrease) in valuation allowance | (7.6) | (43.8) |
| Transaction costs | 0.1 | 1.5 |
| Tax credits generated/utilized | (2.2) | — |
| Return to provision | (6.0) | 15.6 |
| ASU 2017-11 adoption | (1.3) | — |
| Goodwill impairment | 10.9 | — |
| Gain/loss on sale or deconsolidation of a subsidiary | — | 5.7 |
| Bargain purchase gain | — | (24.2) |
| Other | (1.8) | 3.6 |
| Warrant liability | 2.1 | — |
| Income tax (benefit) expense | $ (20.6) | $ 2.4 |
Paragraphs:
The provisions (benefits) for income taxes differed from the amount computed by applying the federal statutory income tax rate to income (loss) before income taxes due to the following items for the years ended December 31, 2019 and 2018 (in millions):
The income tax benefit as of December 31, 2019 is $20.6 million. The benefit was primarily driven by a net valuation allowance release of $37.4 million related to the Insurance segment partially offset by an impairment of goodwill which is not deductible for tax purposes. The Insurance segment is profitable in 2019 and in a three-year overall cumulative income position as of December 31, 2019.
The profitability is driven by current year income associated with favorable claims and reserve development relative to expected. Further, unrealized gains from the investment portfolio continued to grow in 2019.
Question:
What was the percentage increase / (decrease) in the Foreign rate differential from 2018 to 2019?