Pension and Postretirement Health Care

The following tables set forth the net periodic pension and postretirement benefit expense for Northern Trust’s U.S. and non-U.S. pension plans, supplemental pension plan, and postretirement health care plan for the three months ended March 31, 2018 and 2017.

Table 61: Net Periodic Pension Expense (Benefit)



Net Periodic Pension Expense U.S. Plan	Three Months Ended March 31,
(In Millions)	2018			2017
Service Cost	$	10.4		$	9.6
Interest Cost	11.1			11.5
Expected Return on Plan Assets	(22.0		)	(23.5		)
Amortization
Net Actuarial Loss	7.1			4.8
Prior Service Cost	(0.1		)	(0.1		)
Net Periodic Pension Expense	$	6.5		$	2.3



Net Periodic Pension Expense Non-U.S. Plans	Three Months Ended March 31,
(In Millions)	2018			2017
Service Cost	$	0.4		$	—
Interest Cost	1.0			0.9
Expected Return on Plan Assets	(1.1		)	(1.1		)
Net Actuarial Loss Amortization	0.3			0.3
Net Periodic Pension Expense	$	0.6		$	0.1



Net Periodic Pension Expense Supplemental Plan	Three Months Ended March 31,
(In Millions)	2018		2017
Service Cost	$	1.1	$	0.9
Interest Cost	1.3		1.3
Net Actuarial Loss Amortization	1.8		1.4
Net Periodic Pension Expense	$	4.2	$	3.6



Net Periodic Postretirement Expense Postretirement Health Care Plan	Three Months Ended March 31,
(In Millions)	2018		2017
Interest Cost	$	0.3	$	0.4
Net Periodic Postretirement Expense	$	0.3	$	0.4

The components of net periodic pension expense are included in the line item “Employee Benefits” expense in the consolidated statements of income.

Northern Trust contributed $50.0 million to the U.S. pension plan during the three months ended March 31, 2018. There were no contributions to the U.S. pension plan during the three months ended March 31, 2017.