14. Pension and Other Postretirement Plans – 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, 2013 and 2012.


Net Periodic Pension Expense	Three Months Ended						Six Months Ended
U.S. Plan	June 30,						June 30,
(In Millions)	2013			2012			2013			2012
Service Cost	$	7.6		$	8.8		$	15.2		$	17.6
Interest Cost		10.6			10.4			21.1			20.8
Expected Return on Plan Assets		(23.0	)		(21.8	)		(46.1	)		(43.6	)
Amortization
Net Actuarial Loss		10.2			8.6			20.6			17.2
Prior Service Cost		(0.1	)		(0.1	)		(0.2	)		(0.2	)

Net Periodic Pension Expense (Benefit)	$	5.3		$	5.9		$	10.6		$	11.8


Net Periodic Pension Expense	Three Months Ended						Six Months Ended
Non U.S. Plans	June 30,						June 30,
(In Millions)	2013			2012			2013			2012
Interest Cost	$	1.6		$	1.5		$	3.3		$	3.1
Expected Return on Plan Assets		(1.6	)		(1.6	)		(3.1	)		(3.2	)
Net Actuarial Loss Amortization		0.4			0.2			0.5			0.4

Net Periodic Pension Expense (Benefit)	$	0.4		$	0.1		$	0.7		$	0.3


Net Periodic Pension Expense	Three Months Ended						Six Months Ended
Supplemental Plan	June 30,						June 30,
(In Millions)	2013			2012			2013			2012
Service Cost	$	0.4		$	0.7		$	0.8		$	1.4
Interest Cost		1.1			1.1			2.2			2.2
Amortization
Net Actuarial Loss		1.7			1.5			3.4			3.0
Prior Service Cost		0.1			0.1			0.2			0.2

Net Periodic Pension Expense	$	3.3		$	3.4		$	6.6		$	6.8


Net Periodic Postretirement Benefit	Three Months Ended						Six Months Ended
Other Postretirement Plan	June 30,						June 30,
(In Millions)	2013			2012			2013			2012
Service Cost	$	0.1		$	—		$	0.1		$	0.1
Interest Cost		0.3			0.3			0.6			0.7
Amortization
Net Actuarial Gain		(0.3	)		(0.6	)		(0.6	)		(0.9	)
Prior Service Cost		(0.8	)		(1.3	)		(1.5	)		(2.6	)

Net Periodic Postretirement (Benefit) Expense	$	(0.7	)	$	(1.6	)	$	(1.4	)	$	(2.7	)