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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 1, 2017, Northern Trust completed its acquisition of UBS Asset Management’s fund administration servicing businesses in Luxembourg and Switzerland. The purchase price recorded in connection with the closing of the acquisition, which remains subject to adjustment through May 2018, totaled $199.4 million and was comprised of $180.0 million of cash and $19.4 million of contingent consideration.