Pension and Postretirement Health Care (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Components of Company's Net Periodic Benefit Cost

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, 2016 and 2015.

Table 49: Net Periodic Pension Expense (Benefit)

Net Periodic Pension Expense U.S. Plan	Three Months Ended March 31,
(In Millions)	2016			2015
Service Cost	$	9.3		$	9.5
Interest Cost	11.5			11.2
Expected Return on Plan Assets	(23.6		)	(24.1		)
Amortization
Net Actuarial Loss	4.7			7.4
Prior Service Cost	(0.1		)	(0.1		)
Net Periodic Pension Expense	$	1.8		$	3.9

Net Periodic Pension Expense Non-U.S. Plans	Three Months Ended March 31,
(In Millions)	2016			2015
Interest Cost	$	1.3		$	1.4
Expected Return on Plan Assets	(1.3		)	(1.5		)
Net Actuarial Loss Amortization	0.3			0.4
Net Periodic Pension Expense	$	0.3		$	0.3

Net Periodic Pension Expense Supplemental Plan	Three Months Ended March 31,
(In Millions)	2016		2015
Service Cost	$	0.9	$	0.9
Interest Cost	1.3		1.3
Amortization
Net Actuarial Loss	1.5		1.8
Prior Service Cost	—		—
Net Periodic Pension Expense	$	3.7	$	4.0

Net Periodic Postretirement Expense Postretirement Health Care Plan	Three Months Ended March 31,
(In Millions)	2016		2015
Service Cost	$	—	$	—
Interest Cost	0.4		0.3
Amortization
Net Actuarial (Gain)	—		—
Net Periodic Postretirement Expense	$	0.4	$	0.3