Subsequent Events	9 Months Ended
Sep. 30, 2011
Subsequent Events [Abstract]
Subsequent Events	17. Subsequent Events *Tender Offer for the 2013 Convertible Notes* On September 20, 2011, we announced that we had commenced a cash tender offer for any and all of the $428 million aggregate principal amount outstanding of our 2013 Convertible Notes. We offered to purchase the 2013 Convertible Notes at a price of $1,025 for each $1,000 of principal amount of 2013 Convertible Notes tendered, plus accrued and unpaid interest up to, but not including, the date the 2013 Convertible Notes were purchased pursuant to the Offer. At the closing of the Offer on October 19, 2011, $335 million of the aggregate outstanding principal amount of the 2013 Convertible Notes were tendered for $346 million, which included the premium discussed above, accrued interest, and other costs. The 2013 Convertible Notes purchased pursuant to the Offer were cancelled and are no longer outstanding. We funded purchases of the 2013 Convertible Notes tendered in the Offer with cash on hand and availability under the revolver in our new 2011 Credit Facility. See "Tender Offer for the 2013 Convertible Notes," of Note 8, "Debt Obligations," for further discussion of the Offer. *Share Repurchase Program* On October 12, 2011, we announced that our board of directors had approved a share repurchase program authorizing NASDAQ OMX to repurchase in the aggregate up to $300 million of our outstanding common stock. These purchases may be made from time to time at prevailing market prices in open market purchases, privately-negotiated transactions, block purchase techniques or otherwise, as determined by our management. The purchases will be funded from existing cash balances. The share repurchase program may be suspended, modified or discontinued at any time. *Acquisition of Glide Technologies Limited* On October 24, 2011, we announced an agreement to acquire Glide Technologies Limited, or Glide Technologies, a London-based "software as a service provider" specializing in corporate communications and reputation management solutions. Glide Technologies will be part of our Global Corporate Solutions business within our Issuer Services segment. This acquisition will create a fully-integrated workflow solution for investor relations and public relations professionals.

Subsequent Events

9 Months Ended

Sep. 30, 2011

17. Subsequent Events

Tender Offer for the 2013 Convertible Notes

On September 20, 2011, we announced that we had commenced a cash tender offer for any and all of the $428 million aggregate principal amount outstanding of our 2013 Convertible Notes. We offered to purchase the 2013 Convertible Notes at a price of $1,025 for each $1,000 of principal amount of 2013 Convertible Notes tendered, plus accrued and unpaid interest up to, but not including, the date the 2013 Convertible Notes were purchased pursuant to the Offer. At the closing of the Offer on October 19, 2011, $335 million of the aggregate outstanding principal amount of the 2013 Convertible Notes were tendered for $346 million, which included the premium discussed above, accrued interest, and other costs. The 2013 Convertible Notes purchased pursuant to the Offer were cancelled and are no longer outstanding.

We funded purchases of the 2013 Convertible Notes tendered in the Offer with cash on hand and availability under the revolver in our new 2011 Credit Facility. See "Tender Offer for the 2013 Convertible Notes," of Note 8, "Debt Obligations," for further discussion of the Offer.

Share Repurchase Program

On October 12, 2011, we announced that our board of directors had approved a share repurchase program authorizing NASDAQ OMX to repurchase in the aggregate up to $300 million of our outstanding common stock. These purchases may be made from time to time at prevailing market prices in open market purchases, privately-negotiated transactions, block purchase techniques or otherwise, as determined by our management. The purchases will be funded from existing cash balances. The share repurchase program may be suspended, modified or discontinued at any time.

Acquisition of Glide Technologies Limited

On October 24, 2011, we announced an agreement to acquire Glide Technologies Limited, or Glide Technologies, a London-based "software as a service provider" specializing in corporate communications and reputation management solutions. Glide Technologies will be part of our Global Corporate Solutions business within our Issuer Services segment. This acquisition will create a fully-integrated workflow solution for investor relations and public relations professionals.