Please answer the given financial question based on the context.
Context: the fair value of the psu award at the date of grant is amortized to expense over the performance period , which is typically three years after the date of the award , or upon death , disability or reaching the age of 58 . as of december 31 , 2017 , pmi had $ 34 million of total unrecognized compensation cost related to non-vested psu awards . this cost is recognized over a weighted-average performance cycle period of two years , or upon death , disability or reaching the age of 58 . during the years ended december 31 , 2017 , and 2016 , there were no psu awards that vested . pmi did not grant any psu awards during note 10 . earnings per share : unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents are participating securities and therefore are included in pmi 2019s earnings per share calculation pursuant to the two-class method . basic and diluted earnings per share ( 201ceps 201d ) were calculated using the following: .
|( in millions )|for the years ended december 31 , 2017|for the years ended december 31 , 2016|for the years ended december 31 , 2015|
|net earnings attributable to pmi|$ 6035|$ 6967|$ 6873|
|less distributed and undistributed earnings attributable to share-based payment awards|14|19|24|
|net earnings for basic and diluted eps|$ 6021|$ 6948|$ 6849|
|weighted-average shares for basic eps|1552|1551|1549|
|plus contingently issuable performance stock units ( psus )|1|2014|2014|
|weighted-average shares for diluted eps|1553|1551|1549|
for the 2017 , 2016 and 2015 computations , there were no antidilutive stock options. .
Question: what was the change in weighted-average shares for diluted eps from 2015 to 2016 , in millions?


Answer: The answer is:2.0