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Other Operating Expense (Tables)
 6 Months Ended
Jun. 30, 2024
Other Income and Expenses [Abstract]  
Summary of other operating expenses
The components of Other Operating Expense were as follows.
TABLE 71: OTHER OPERATING EXPENSE
THREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
 In Millions)2024202320242023
Business Promotion$20.8 $21.1 $37.5 $37.3 
Staff Related8.2 8.9 22.4 16.7 
FDIC Insurance Premiums(1)
9.8 6.6 28.5 12.8 
Charitable Contributions(2)
74.0 4.3 76.0 7.5 
Other Expenses62.5 71.1 111.3 123.3 
Total Other Operating Expense$175.3 $112.0 $275.7 $197.6 
(1) FDIC Insurance Premiums include an additional FDIC Special Assessment of $2.3 million for the three months ended June 30, 2024 and $14.7 million for the the six months ended June 30, 2024. Refer to Note 20—Commitments and Contingent Liabilities for further information.
(2) Charitable Contributions include a $70.0 million charitable commitment to the Northern Trust Foundation for the three and six months ended June 30, 2024.