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Pension (Tables)
9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Net Periodic Pension Expense (Benefit)
The following table sets forth the net periodic pension expense for Northern Trust’s U.S. Qualified Plan, Non-U.S. Pension Plans, and U.S. Non-Qualified Plan for the three and nine months ended September 30, 2023 and 2022.
TABLE 72: NET PERIODIC PENSION EXPENSE (BENEFIT)
U.S. QUALIFIED PLANTHREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2023202220232022
Service Cost$11.5 $11.1 $34.5 $37.5 
Interest Cost13.5 12.5 40.5 33.1 
Expected Return on Plan Assets(25.3)(21.9)(75.9)(62.3)
Amortization
Net Actuarial Loss0.4 — 1.2 11.4 
Prior Service Cost (Credit) —  (0.1)
Net Periodic Pension Expense$0.1 $1.7 $0.3 $19.6 
Settlement Expense 17.0  37.3 
Total Pension Expense$0.1 $18.7 $0.3 $56.9 
NON-U.S. PENSION PLANSTHREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2023202220232022
Service Cost$0.4 $0.4 $1.1 $1.3 
Interest Cost1.2 0.6 3.6 1.9 
Expected Return on Plan Assets(1.6)(0.7)(4.7)(2.2)
Amortization
Net Actuarial (Gain) Loss (0.1)0.2 (0.3)0.6 
Net Periodic Pension (Benefit) Expense $(0.1)$0.5 $(0.3)$1.6 
Settlement Expense —  0.7 
Total Pension (Benefit) Expense $(0.1)$0.5 $(0.3)$2.3 
U.S. NON-QUALIFIED PLANTHREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2023202220232022
Service Cost$1.2 $1.4 $3.6 $4.2 
Interest Cost1.3 1.0 3.9 3.0 
Amortization
Net Actuarial Loss 1.3 1.8 3.9 5.4 
Net Periodic Pension Expense$3.8 $4.2 $11.4 $12.6