French term (edited): les motifs et le dispositif d'une decision

Hardly necessary to add judgment.

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Note added at 9 mins (2011-03-27 14:41:12 GMT)
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I believe that a ruling can be interim, also that a judgment can contain a number of rulings.

"The County Court ruled against Mr Malcolm on three main grounds: ... In the judgment the House of Lords ruled that: in DDA premises claims, ..."
www.equalityhumanrights.com/legal-and.../the-malcolm-case/

"... If anything, the ruling widens the grounds for defence under this law rather than narrowing them. Phil Woolas Judgement ..."
www.libdemvoice.org/the-final-phil-woolas-judgement-its-leg...

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Note added at 7 hrs (2011-03-27 22:10:40 GMT)
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Actually, perhaps it is necessary to use the word "judgement" too to translate "décision":

"A RULING is what the judge issues when he is is faced with a particular question on which a legal decision that has be made. A JUDGEMENT is what the judge issues at the conclusion of a trial or hearing after all the evidence has been presented and he has considered all legal aspects of the arguments, and applicable law."

Read more: http://wiki.answers.com/Q/What_is_the_difference_in_a_judgem...

Harrap's Dictionnaire Juridique defines dispositif as "(partie du jugement) ruling" . Though it also, confusingly translates décision variously as "decision", "judgement" and "ruling" depending upon the context. The Asker, of course, has at his disposal rather more context than he has provided to us.

French term (edited): les motifs et le dispositif d'une decision

Just another possibility.
(You can google it and find lots – millions – of relevant hits.)

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Note added at 8 hrs (2011-03-27 22:43:24 GMT)
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In reviewing the ghits – this is embarrassing – I find there are not millions (I stumbled on a Google bug!), but still, here's a selection:

"Reasons and judgment – September 5, 2000"
http://www.ic.gc.ca/eic/site/bsf-osb.nsf/eng/br02482.html

"Reasons and judgment on cross-appeal delivered: January 27, 1995."
http://ca.vlex.com/vid/children-aid-society-metropolitan-tor...

"Reasons and judgment as to appeal on the merits: March 20, 1997."
http://www.canlii.org/en/ca/scc/doc/1997/1997canlii385/1997c...

"...if there is more than one judge hearing the matter, usually each will give his/her own reasons and judgment."
http://www.abc.net.au/corp/pubs/legal/court/chap11.html

"When a record is composed of more than one volume, the pleadings, documents and exhibits, orders of court, minutes, reasons and judgment of the court, petition or motion and order, and bond of appeal shall be included..."
http://www.lasc.org/rules/supreme/RuleI.asp

"In De Mond v R., Justice Lamarre of Canada's Tax Court, after taking eleven months to cogitate upon his reasons and judgment, used these words..."
http://www.duhaime.org/LegalDictionary/B/BareTrust.aspx

"A review of the written reasons and judgment in its entirety does not support the majority’s determination that the WCJ used the wrong standard in its decision."
http://caselaw.findlaw.com/la-supreme-court/1552947.html

"The judgment of the Tax Court is reversed for the foregoing reasons and judgment rendered in favor of Payne..."
http://ftp.resource.org/courts.gov/c/F3/224/224.F3d.415.99-6...

"The reasons and judgment provided by the trial judge, however, did not entirely address the presence of the religious features at play in the case:"
http://works.bepress.com/cgi/viewcontent.cgi?article=1001&co...

OK, that's enough for now... You can look at the rest on your own.