6. EMPLOYEE BENEFIT PLANS

The components of net periodic benefit cost (credit) are as follows:



	Pension Benefits
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014			2013
	(in millions)

Service cost	$	0.9		$	0.8		$	2.7		$	2.6
Interest cost	9.0			8.5			27.0			25.5
Expected asset return	(12.1		)	(11.5		)	(36.3		)	(34.5		)
Amortized loss	1.3			2.2			3.9			7.0
Amortized prior service cost	—			4.8			—			5.4
Net periodic benefit cost (credit)	$	(0.9	)	$	4.8		$	(2.7	)	$	6.0

	Other Postretirement Benefits
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014			2013
	(in millions)

Service cost	$	0.1		$	0.1		$	0.3		$	0.3
Interest cost	3.8			3.3			11.4			9.9
Amortized loss	0.2			0.2			0.6			0.6
Amortized prior service credit	(0.7		)	(0.4		)	(2.1		)	(1.3		)
Net periodic benefit cost	$	3.4		$	3.2		$	10.2		$	9.5

Due to the availability of our prefunding balances (previous contributions in excess of prior required pension contributions), we are not required to make any cash payments in 2014. We expect our cash payments for other postretirement benefit obligations in 2014, net of GM cost sharing, to be approximately $17 million.

In the third quarter of 2013, we remeasured our AAM Supplemental Executive Retirement Plan (SERP) due to the passing of our Co-Founder and Executive Chairman of the Board of Directors. As a result of this remeasurement, we recorded $4.7 million in selling, general & administrative expense related to the acceleration of prior service cost.