Pension and Postretirement Health Care (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Net Periodic Pension Expense (Benefit)

The following table sets 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, 2019 and 2018.

Table 66: Net Periodic Pension Expense (Benefit)

Net Periodic Pension Expense U.S. Plan	Three Months Ended March 31,
(In Millions)	2019			2018
Service Cost	$	10.4		$	10.4
Interest Cost	11.8			11.1
Expected Return on Plan Assets	(21.7		)	(22.0		)
Amortization
Net Actuarial Loss	4.3			7.1
Prior Service Cost	(0.1		)	(0.1		)
Net Periodic Pension Expense	$	4.7		$	6.5

Net Periodic Pension Expense Non-U.S. Plans	Three Months Ended March 31,
(In Millions)	2019			2018
Service Cost	$	0.5		$	0.4
Interest Cost	1.0			1.0
Expected Return on Plan Assets	(1.0		)	(1.1		)
Settlement Expense	—			—
Net Actuarial Loss Amortization	0.1			0.3
Net Periodic Pension Expense	$	0.6		$	0.6

Net Periodic Pension Expense Supplemental Plan	Three Months Ended March 31,
(In Millions)	2019		2018
Service Cost	$	1.0	$	1.1
Interest Cost	1.5		1.3
Amortization
Net Actuarial Loss	1.4		1.8
Prior Service Cost	—		—
Net Periodic Pension Expense	$	3.9	$	4.2

Net Periodic Postretirement Expense Postretirement Health Care Plan	Three Months Ended March 31,
(In Millions)	2019			2018
Service Cost	$	—		$	—
Interest Cost	0.3			0.3
Amortization
Net Actuarial (Gain)	(0.3		)	—
Prior Service Cost	$	—		$	—
Net Periodic Postretirement Expense	$	—		$	0.3