pre_text: The accumulated benefit obligation for the United States defined benefit pension plans was $198.2 million and $172.8 million at December 31, 2019 and 2018, respectively. The accumulated benefit obligation for foreign defined benefit pension plans was $39.9 million and $35.6 million at December 31, 2019 and 2018, respectively. Information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31:
table: 2019 2018
table: United States Foreign United States Foreign
table: (in millions)
table: Projected benefit obligation $55.3 $44.0 $50.8 $39.1
table: Accumulated benefit obligation 53.2 39.9 48.6 35.6
table: Fair value of plan assets — 1.6 — 1.4
question: Analyse this data from a financial earnings document. What was the change in the accumulated benefit obligation for foreign defined benefit pension plans in 2019 from 2018?