Pension and Other Postretirement Plans (Tables)

6 Months Ended

Jun. 30, 2014

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 other postretirement plan for the three and six months ended June 30, 2014 and 2013.

Net Periodic Pension Expense U.S. Plan	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2014			2013			2014			2013
Service Cost	$	8.2		$	7.6		$	16.4		$	15.2
Interest Cost		11.1			10.6			22.2			21.1
Expected Return on Plan Assets		(24.5	)		(23.0	)		(48.9	)		(46.1	)
Amortization
Net Actuarial Loss		(0.1	)		10.2			(0.2	)		20.6
Prior Service Cost		5.3			(0.1	)		10.7			(0.2	)
Net Periodic Pension Expense	$	—		$	5.3		$	0.2		$	10.6

Net Periodic Pension Expense (Benefit) Non U.S. Plans	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2014			2013			2014			2013
Interest Cost	$	1.8		$	1.6		$	3.5		$	3.3
Expected Return on Plan Assets		(1.8	)		(1.6	)		(3.5	)		(3.1	)
Net Actuarial Loss Amortization		(0.4	)		0.4			(0.8	)		0.5
Net Periodic Pension Expense (Benefit)	$	(0.4	)	$	0.4		$	(0.8	)	$	0.7

Net Periodic Pension Expense Supplemental Plan	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2014		2013		2014		2013
Service Cost	$	0.7	$	0.4	$	1.5	$	0.8
Interest Cost		1.2		1.1		2.4		2.2
Amortization
Net Actuarial Loss		0.1		1.7		0.2		3.4
Prior Service Cost		1.4		0.1		2.9		0.2
Net Periodic Pension Expense	$	3.4	$	3.3	$	7.0	$	6.6

Net Periodic Postretirement Expense (Benefit) Other Postretirement Plan	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2014			2013			2014			2013
Service Cost	$	0.1		$	0.1		$	0.1		$	0.1
Interest Cost		0.3			0.3			0.7			0.6
Amortization
Net Actuarial Gain		—			(0.3	)		—			(0.6	)
Prior Service Cost		(0.2	)		(0.8	)		(0.3	)		(1.5	)
Net Periodic Postretirement Expense (Benefit)	$	0.2		$	(0.7	)	$	0.5		$	(1.4	)