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 and nine months ended September 30, 2017 and 2016.

Table 57: Net Periodic Pension Expense (Benefit)



Net Periodic Pension Expense U.S. Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2017			2016			2017			2016
Service Cost	$	9.6		$	9.3		$	28.8		$	28.0
Interest Cost	11.4			11.5			34.4			34.4
Expected Return on Plan Assets	(23.4		)	(23.6		)	(70.4		)	(70.8		)
Amortization
Net Actuarial Loss	4.7			4.7			14.3			14.1
Prior Service Cost	(0.1		)	(0.1		)	(0.3		)	(0.3		)
Net Periodic Pension Expense	$	2.2		$	1.8		$	6.8		$	5.4



Net Periodic Pension Expense Non-U.S. Plans	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2017			2016			2017			2016
Interest Cost	$	1.0		$	1.2		$	2.9		$	3.7
Expected Return on Plan Assets	(1.1		)	(1.2		)	(3.3		)	(3.7		)
Settlement Expense	0.7			—			0.9			—
Net Actuarial Loss Amortization	0.4			0.3			1.0			0.8
Net Periodic Pension Expense	$	1.0		$	0.3		$	1.5		$	0.8



Net Periodic Pension Expense Supplemental Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2017		2016		2017		2016
Service Cost	$	1.0	$	0.9	$	2.8	$	2.6
Interest Cost	1.3		1.3		3.9		3.9
Amortization
Net Actuarial Loss	1.5		1.5		4.3		4.4
Prior Service Cost	0.1		—		0.1		0.1
Net Periodic Pension Expense	$	3.9	$	3.7	$	11.1	$	11.0



Net Periodic Postretirement Expense Postretirement Health Care Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2017		2016		2017		2016
Service Cost	$	0.1	$	—	$	0.1	$	0.1
Interest Cost	0.3		0.4		1.1		1.1
Amortization
Net Actuarial (Gain)	—		—		—		—
Net Periodic Postretirement Expense	$	0.4	$	0.4	$	1.2	$	1.2