Pension and Postretirement Health Care

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

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, 2016 and 2015.

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)	2016			2015			2016			2015
Service Cost	$	9.3		$	9.5		$	28.0		$	28.4
Interest Cost	11.5			11.1			34.4			33.5
Expected Return on Plan Assets	(23.6		)	(24.1		)	(70.8		)	(72.3		)
Amortization
Net Actuarial Loss	4.7			7.5			14.1			22.3
Prior Service Cost	(0.1		)	(0.1		)	(0.3		)	(0.3		)
Net Periodic Pension Expense	$	1.8		$	3.9		$	5.4		$	11.6



Net Periodic Pension Expense Non-U.S. Plans	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2016			2015			2016			2015
Interest Cost	$	1.2		$	1.4		$	3.7		$	4.2
Expected Return on Plan Assets	(1.2		)	(1.5		)	(3.7		)	(4.4		)
Net Actuarial Loss Amortization	0.3			0.4			0.8			1.2
Net Periodic Pension Expense	$	0.3		$	0.3		$	0.8		$	1.0



Net Periodic Pension Expense Supplemental Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2016		2015		2016		2015
Service Cost	$	0.9	$	0.9	$	2.6	$	2.7
Interest Cost	1.3		1.3		3.9		3.8
Amortization
Net Actuarial Loss	1.5		1.8		4.4		5.5
Prior Service Cost	—		—		0.1		0.1
Net Periodic Pension Expense	$	3.7	$	4.0	$	11.0	$	12.1



Net Periodic Postretirement Expense Postretirement Health Care Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2016		2015		2016		2015
Service Cost	$	—	$	—	$	0.1	$	0.1
Interest Cost	0.4		0.3		1.1		1.0
Amortization
Net Actuarial (Gain)	—		—		—		—
Net Periodic Postretirement Expense	$	0.4	$	0.3	$	1.2	$	1.1