pre_text: The following table summarizes the activity related to the Company's gross unrecognized tax benefits from April 1, 2016 to March 31, 2019 (amounts in millions): As of March 31, 2019 and March 31, 2018, the Company had accrued interest and penalties related to tax contingencies of $88.1 million and $80.8 million, respectively. Interest and penalties charged to operations for the years ended March 31, 2018 and 2017 related to the Company's uncertain tax positions were $5.4 million and $5.8 million, respectively. Previously accrued interest and penalties that were released during the year ended March 31, 2019 were $37.5 million. The total amount of gross unrecognized tax benefits was $763.4 million and $436.0 million as of March 31, 2019 and March 31, 2018, respectively, of which $664.4 million and $436.0 million is estimated to impact the Company's effective tax rate, if recognized. The Company estimates that it is reasonably possible unrecognized tax benefits as of March 31, 2019 could decrease by approximately $50.0 million in the next 12 months. Positions that may be resolved include various U.S. and non-U.S. matters.
table: Year Ended March 31,
table: 2019 2018 2017
table: Beginning balance $436.0 $398.5 $220.7
table: Increases related to acquisitions 329.7 — 193.3
table: Decreases related to settlements with tax authorities (8.3) (0.1) (11.7)
table: Decreases related to statute of limitation expirations (16.2) (10.9) (7.6)
table: Increases related to current year tax positions 27.8 30.3 26.3
table: Increases (decreases) related to prior year tax positions (5.6) 18.2 (22.5)
table: Ending balance $763.4 $436.0 $398.5
question: Analyse this data from a financial earnings document. What was the change in the Beginning balance between 2017 and 2018?