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Goodwill and Other Intangibles
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangibles
Goodwill and Other Intangibles
The carrying amounts of goodwill and other intangibles assets, reflecting the effect of foreign exchange rates on non-U.S.-dollar-denominated balances, by reporting segment at March 31, 2018, and December 31, 2017, were as follows:
Table 51: Goodwill by Reporting Segment
(In Millions)
March 31,
2018
 
December 31,
2017
Corporate & Institutional Services
$
540.4

 
$
534.5

Wealth Management
71.2

 
71.1

Total Goodwill
$
611.6

 
$
605.6


The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of March 31, 2018 and December 31, 2017, were as follows:
Table 52: Other Intangible Assets
(In Millions)
March 31,
2018
 
December 31,
2017
Gross Carrying Amount
$
222.2

 
$
222.7

Less: Accumulated Amortization
61.9

 
61.3

Net Book Value
$
160.3

 
$
161.4


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 totaled $4.5 million and $2.4 million for the three months ended March 31, 2018 and 2017, respectively. Amortization for the remainder of 2018 and for the years 2019, 2020, 2021, and 2022 is estimated to be $13.4 million, $17.7 million, $17.6 million, $15.0 million, and $10.4 million, respectively.