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Recent Accounting Pronouncements
6 Months Ended
Jun. 30, 2021
Accounting Changes and Error Corrections [Abstract]  
Recent Accounting Pronouncements Recent Accounting Pronouncements
On January 1, 2021, Northern Trust adopted Accounting Standards Update (ASU) No. 2020-01, “Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying the Interactions between Topic 321, Topic 323, and Topic 815” (ASU 2020-01). ASU 2020-01 addresses two accounting issues: (1) application of the measurement alternative under Topic 321 in correlation with the transition into and out of the equity method under Topic 323 and (2) the measurement of certain forward contracts and purchased options to acquire equity securities. ASU 2020-01 clarifies that an entity applying the measurement alternative under Topic 321 that must transition to the equity method under Topic 323 because of an observable transaction will remeasure its investment immediately before transition, whereas an entity applying the equity method under Topic 323 that must transition to Topic 321 because of an observable transaction will remeasure its investment immediately after transition. ASU 2020-01 also clarifies that certain forward contracts or purchased call options to acquire equity securities generally will be measured using the fair value principles of Topic 321 before settlement or exercise. Upon adoption of ASU 2020-01, there was no significant impact to Northern Trust’s consolidated balance sheets or consolidated statements of income.

On January 1, 2021, Northern Trust adopted ASU No. 2020-08, “Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs” (ASU 2020-08). ASU 2020-08 clarifies the Codification related to the standard issued in ASU No. 2017-08, “Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” ASU 2020-08 clarifies that an entity should amortize premiums on purchased callable debt securities to the first call date and related call amount and at that point reassess if there is a remaining premium to amortize to a subsequent call date. Upon adoption of ASU 2020-08, there was no significant impact to Northern Trust’s consolidated balance sheets or consolidated statements of income.

On January 7, 2021, Northern Trust retrospectively adopted ASU No. 2021-01, “Reference Rate Reform (Topic 848): Scope” (ASU 2021-01). ASU 2021-01 clarifies the scope of Topic 848 to explicitly include those derivative instruments affected by changes in interest rates used for margining, discounting, or contract price alignment as eligible for certain optional expedients and exceptions in Topic 848. Upon adoption of ASU 2021-01, Northern Trust elected the expedients provided in Topic 848 with no significant impact on Northern Trust’s consolidated balance sheets or consolidated statements of income.