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Pension and Postretirement Health Care (Tables)
6 Months Ended
Jun. 30, 2021
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 six months ended June 30, 2021 and 2020.
TABLE 72: NET PERIODIC PENSION EXPENSE (BENEFIT)
U.S. QUALIFIED PLANTHREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
(In Millions)2021202020212020
Service Cost$13.2 $11.8 $26.4 $23.6 
Interest Cost9.8 10.8 19.6 21.6 
Expected Return on Plan Assets(20.1)(19.2)(40.2)(38.4)
Amortization
Net Actuarial Loss9.4 8.8 18.8 17.6 
Prior Service Cost(0.1)(0.1)(0.2)(0.2)
Settlement Expense17.6 — 17.6 — 
Net Periodic Pension Expense$29.8 $12.1 $42.0 $24.2 
NON-U.S. PENSION PLANSTHREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
(In Millions)2021202020212020
Service Cost$0.6 $0.5 $1.1 $1.0 
Interest Cost0.5 0.7 1.1 1.4 
Expected Return on Plan Assets(0.7)(0.8)(1.3)(1.5)
Amortization
Net Actuarial Loss0.2 0.3 0.5 0.6 
Prior Service Cost0.1 — 0.1 — 
Settlement Expense0.7 — 0.9 0.2 
Net Periodic Pension Expense$1.4 $0.7 $2.4 $1.7 
U.S. NON-QUALIFIED PLANTHREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
(In Millions)2021202020212020
Service Cost$1.3 $1.1 $2.6 $2.2 
Interest Cost1.0 1.2 1.9 2.4 
Amortization
Net Actuarial Loss 2.0 1.8 4.1 3.6 
Prior Service Cost 0.1  0.1 
Net Periodic Pension Expense$4.3 $4.2 $8.6 $8.3 
POSTRETIREMENT HEALTH CARE PLANTHREE MONTHS ENDED JUNE 30,SIX MONTHS ENDED JUNE 30,
(In Millions)2021202020212020
Service Cost$ $— $ $— 
Interest Cost0.1 0.2 0.2 0.4 
Amortization
Net Actuarial (Gain) (0.2)(0.1)(0.4)
Prior Service Cost(0.3)— (0.5)— 
Net Periodic Postretirement Expense$(0.2)$— $(0.4)$—