Pension and Postretirement Health Care

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Pension and Postretirement Health Care

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, 2015 and 2014.

Table 56: Net Periodic Pension Expense (Benefit)

Net Periodic Pension Expense U.S. Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2015			2014			2015			2014
Service Cost	$	9.5		$	8.2		$	28.4		$	24.6
Interest Cost	11.1			11.1			33.5			33.3
Expected Return on Plan Assets	(24.1		)	(24.4		)	(72.3		)	(73.3		)
Amortization
Net Actuarial Loss	7.5			5.4			22.3			16.1
Prior Service Cost	(0.1		)	(0.1		)	(0.3		)	(0.3		)
Net Periodic Pension Expense	$	3.9		$	0.2		$	11.6		$	0.4

Net Periodic Pension Expense (Benefit) Non-U.S. Plans	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2015			2014			2015			2014
Interest Cost	$	1.4		$	1.8		$	4.2		$	5.3
Expected Return on Plan Assets	(1.5		)	(1.8		)	(4.4		)	(5.3		)
Net Actuarial Loss Amortization	0.4			(0.4		)	1.2			(1.2		)
Net Periodic Pension Expense (Benefit)	$	0.3		$	(0.4	)	$	1.0		$	(1.2	)

Net Periodic Pension Expense Supplemental Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2015		2014		2015		2014
Service Cost	$	0.9	$	0.8	$	2.7	$	2.3
Interest Cost	1.3		1.2		3.8		3.6
Amortization
Net Actuarial Loss	1.8		1.5		5.5		4.4
Prior Service Cost	—		0.2		0.1		0.4
Net Periodic Pension Expense	$	4.0	$	3.7	$	12.1	$	10.7

Net Periodic Postretirement Expense (Benefit) Postretirement Health Care Plan	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2015		2014			2015		2014
Service Cost	$	—	$	—		$	0.1	$	0.1
Interest Cost	0.3		0.4			1.0		1.1
Amortization
Net Actuarial (Gain)	—		(0.1		)	—		(0.4		)
Net Periodic Postretirement Expense	$	0.3	$	0.3		$	1.1	$	0.8