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Goodwill and Other Intangibles
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangibles
Goodwill and Other Intangibles
Goodwill. Changes by reporting segment in the carrying amount of goodwill for the years ended December 31, 2017 and 2016, including the effect of foreign exchange rates on non-U.S.-dollar-denominated balances, were as follows:

TABLE 73: GOODWILL
(In Millions)
CORPORATE &
INSTITUTIONAL
SERVICES

WEALTH
MANAGEMENT

TOTAL

Balance at December 31, 2015
$
455.1

$
71.3

$
526.4

Goodwill Acquired
11.8


11.8

Foreign Exchange Rates
(18.5
)
(0.3
)
(18.8
)
 
 
 
 
Balance at December 31, 2016
$
448.4

$
71.0

$
519.4

Goodwill Acquired
78.3


78.3

Measurement Period Adjustments
(1.3
)

(1.3
)
Foreign Exchange Rates
9.1

0.1

9.2

 
 
 
 
Balance at December 31, 2017
$
534.5

$
71.1

$
605.6



Other Intangible Assets Subject to Amortization. The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of December 31, 2017 and 2016 were as follows:

TABLE 74: OTHER INTANGIBLE ASSETS
 
                      DECEMBER 31,
(In Millions)
2017

2016

Gross Carrying Amount
$
222.7

$
89.0

Less: Accumulated Amortization
61.3

47.2

 
 
 
Net Book Value
$
161.4

$
41.8



Other intangible assets consist primarily of the value of acquired client relationships and are included within other assets in the consolidated balance sheets. Amortization expense related to other intangible assets was $11.4 million, $8.8 million, and $10.9 million for the years ended December 31, 2017, 2016, and 2015, respectively. Amortization for the years 2018, 2019, 2020, 2021, and 2022 is estimated to be $17.5 million, $17.4 million, $17.3 million, $14.8 million, and $10.1 million respectively.
On October 1, 2017, Northern Trust completed its acquisition of UBS Asset Management’s fund administration servicing business 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 $190.8 million and was comprised of $188.5 million of cash and $2.3 million of contingent consideration. Goodwill and other intangible assets associated with the acquisition totaled $78.3 million and $126.0 million, respectively.
In May 2016, Northern Trust completed its acquisition of Aviate Global LLP (Aviate), an institutional equity brokerage firm offering market research and execution services, with offices in the U.S., Europe, and the Asia-Pacific region. The purchase price, which is subject to certain performance-related adjustments over a three-year period after the acquisition date, totaled $18.8 million inclusive of contingent consideration. Goodwill and other intangible assets associated with the acquisition totaled $10.5 million and $5.8 million, respectively.