of prior service cost or credits , and net actuarial gains or losses ) as part of non-operating income .
we adopted the requirements of asu no .
2017-07 on january 1 , 2018 using the retrospective transition method .
we expect the adoption of asu no .
2017-07 to result in an increase to consolidated operating profit of $ 471 million and $ 846 million for 2016 and 2017 , respectively , and a corresponding decrease in non-operating income for each year .
we do not expect any impact to our business segment operating profit , our consolidated net earnings , or cash flows as a result of adopting asu no .
2017-07 .
intangibles-goodwill and other in january 2017 , the fasb issued asu no .
2017-04 , intangibles-goodwill and other ( topic 350 ) , which eliminates the requirement to compare the implied fair value of reporting unit goodwill with the carrying amount of that goodwill ( commonly referred to as step 2 ) from the goodwill impairment test .
the new standard does not change how a goodwill impairment is identified .
wewill continue to perform our quantitative and qualitative goodwill impairment test by comparing the fair value of each reporting unit to its carrying amount , but if we are required to recognize a goodwill impairment charge , under the new standard the amount of the charge will be calculated by subtracting the reporting unit 2019s fair value from its carrying amount .
under the prior standard , if we were required to recognize a goodwill impairment charge , step 2 required us to calculate the implied value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination and the amount of the charge was calculated by subtracting the reporting unit 2019s implied fair value of goodwill from its actual goodwill balance .
the new standard is effective for interim and annual reporting periods beginning after december 15 , 2019 , with early adoption permitted , and should be applied prospectively from the date of adoption .
we elected to adopt the new standard for future goodwill impairment tests at the beginning of the third quarter of 2017 , because it significantly simplifies the evaluation of goodwill for impairment .
the impact of the new standard will depend on the outcomes of future goodwill impairment tests .
derivatives and hedging inaugust 2017 , the fasb issuedasu no .
2017-12derivatives and hedging ( topic 815 ) , which eliminates the requirement to separately measure and report hedge ineffectiveness .
the guidance is effective for fiscal years beginning after december 15 , 2018 , with early adoption permitted .
we do not expect a significant impact to our consolidated assets and liabilities , net earnings , or cash flows as a result of adopting this new standard .
we plan to adopt the new standard january 1 , 2019 .
leases in february 2016 , the fasb issuedasu no .
2016-02 , leases ( topic 842 ) , which requires the recognition of lease assets and lease liabilities on the balance sheet and disclosure of key information about leasing arrangements for both lessees and lessors .
the new standard is effective january 1 , 2019 for public companies , with early adoption permitted .
the new standard currently requires the application of a modified retrospective approach to the beginning of the earliest period presented in the financial statements .
we are continuing to evaluate the expected impact to our consolidated financial statements and related disclosures .
we plan to adopt the new standard effective january 1 , 2019 .
note 2 2013 earnings per share theweighted average number of shares outstanding used to compute earnings per common sharewere as follows ( in millions ) : .

2017
2016
2015
Weighted average common shares outstanding for basic computations
287.8
299.3
310.3
Weighted average dilutive effect of equity awards
2.8
3.8
4.4
Weighted average common shares outstanding for diluted computations
290.6
303.1
314.7

we compute basic and diluted earnings per common share by dividing net earnings by the respectiveweighted average number of common shares outstanding for the periods presented .
our calculation of diluted earnings per common share also includes the dilutive effects for the assumed vesting of outstanding restricted stock units ( rsus ) , performance stock units ( psus ) and exercise of outstanding stock options based on the treasury stock method .
there were no significant anti-dilutive equity awards for the years ended december 31 , 2017 , 2016 and 2015 .
note 3 2013 acquisitions and divestitures acquisition of sikorsky aircraft corporation on november 6 , 2015 , we completed the acquisition of sikorsky from united technologies corporation ( utc ) and certain of utc 2019s subsidiaries .
the purchase price of the acquisition was $ 9.0 billion , net of cash acquired .
as a result of the acquisition .

Question: Analyse this data from a financial earnings document. what was the change in millions of weighted average common shares outstanding for diluted computations from 2015 to 2016?
Choices:
-11.6
0
-212.6
301.1
617.8
Correct choice index: 0