Pension and Postretirement Health Care

3 Months Ended

Mar. 31, 2017

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 months ended March 31, 2017 and 2016.

Table 58: Net Periodic Pension Expense (Benefit)

Net Periodic Pension Expense U.S. Plan	Three Months Ended March 31,
(In Millions)	2017			2016
Service Cost	$	9.6		$	9.3
Interest Cost	11.5			11.5
Expected Return on Plan Assets	(23.5		)	(23.6		)
Amortization
Net Actuarial Loss	4.8			4.7
Prior Service Cost	(0.1		)	(0.1		)
Net Periodic Pension Expense	$	2.3		$	1.8

Net Periodic Pension Expense Non-U.S. Plans	Three Months Ended March 31,
(In Millions)	2017			2016
Interest Cost	$	0.9		$	1.3
Expected Return on Plan Assets	(1.1		)	(1.3		)
Net Actuarial Loss Amortization	0.3			0.3
Net Periodic Pension Expense	$	0.1		$	0.3

Net Periodic Pension Expense Supplemental Plan	Three Months Ended March 31,
(In Millions)	2017		2016
Service Cost	$	0.9	$	0.9
Interest Cost	1.3		1.3
Amortization
Net Actuarial Loss	1.4		1.5
Prior Service Cost	—		—
Net Periodic Pension Expense	$	3.6	$	3.7

Net Periodic Postretirement Expense Postretirement Health Care Plan	Three Months Ended March 31,
(In Millions)	2017		2016
Service Cost	$	—	$	—
Interest Cost	0.4		0.4
Amortization
Net Actuarial (Gain)	—		—
Net Periodic Postretirement Expense	$	0.4	$	0.4