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Pension and Postretirement Health Care (Tables)
9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Net Periodic Pension Expense (Benefit)
The following table sets forth the net periodic pension and postretirement benefit expense for Northern Trust’s U.S. Qualified Plan, Non-U.S. Pension Plans, U.S. Non-Qualified Plan, and postretirement health care plan for the three and nine months ended September 30, 2020 and 2019.
TABLE 73: NET PERIODIC PENSION EXPENSE (BENEFIT)
U.S. QUALIFIED PLANTHREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2020201920202019
Service Cost$11.9 $10.4 $35.5 $31.2 
Interest Cost10.8 11.8 32.4 35.4 
Expected Return on Plan Assets(19.2)(21.7)(57.6)(65.1)
Amortization
Net Actuarial Loss8.8 4.3 26.4 12.9 
Prior Service Cost(0.1)(0.1)(0.3)(0.3)
Net Periodic Pension Expense$12.2 $4.7 $36.4 $14.1 
NON-U.S. PENSION PLANSTHREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2020201920202019
Service Cost$0.6 $0.5 $1.6 $1.5 
Interest Cost0.7 0.9 2.1 2.9 
Expected Return on Plan Assets(0.8)(1.0)(2.3)(2.9)
Settlement Expense0.1 — 0.3 — 
Amortization
Net Actuarial Loss0.2 0.2 0.8 0.5 
Prior Service Cost0.1 — 0.1 — 
Net Periodic Pension Expense$0.9 $0.6 $2.6 $2.0 
U.S. NON-QUALIFIED PLANTHREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2020201920202019
Service Cost$1.2 $1.1 $3.4 $3.1 
Interest Cost1.2 1.5 3.6 4.4 
Amortization
Net Actuarial Loss 1.7 1.4 5.3 4.2 
Prior Service Cost — 0.1 0.1 
Net Periodic Pension Expense$4.1 $4.0 $12.4 $11.8 
POSTRETIREMENT HEALTH CARE PLANTHREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2020201920202019
Interest Cost$0.2 $0.3 $0.6 $0.9 
Amortization
Net Actuarial (Gain)(0.1)(0.2)(0.5)(0.8)
Prior Service Cost(0.1)— (0.1)— 
Net Periodic Postretirement Expense$ $0.1 $ $0.1