Benefit Plans

The components of net periodic benefit cost for the three months ended September 30 were as follows ($ in millions):



	Pension benefits						Other retirement benefits						Total
	2014			2013			2014			2013			2014			2013
Service cost	$	2.3		$	2.3		$	0.1		$	0.1		$	2.4		$	2.4
Interest cost	4.2			3.6			0.1			—			4.3			3.6
Expected return on assets	(4.7		)	(4.3		)	—			—			(4.7		)	(4.3		)
Amortization of prior service credit	(0.3		)	(0.3		)	—			—			(0.3		)	(0.3		)
Recognized actuarial losses (gains)	1.3			2.2			(0.5		)	(0.5		)	0.8			1.7
Net periodic benefit cost	$	2.8		$	3.5		$	(0.3	)	$	(0.4	)	$	2.5		$	3.1

The components of net periodic benefit cost for the nine months ended September 30 were as follows ($ in millions):



	Pension benefits						Other retirement benefits						Total
	2014			2013			2014			2013			2014			2013
Service cost	$	7.4		$	7.3		$	0.3		$	0.8		$	7.7		$	8.1
Interest cost	12.7			11.0			0.3			0.5			13.0			11.5
Expected return on assets	(14.4		)	(12.9		)	—			—			(14.4		)	(12.9		)
Amortization of transition obligation	0.1			0.1			—			—			0.1			0.1
Amortization of prior service credit	(1.0		)	(1.0		)	—			—			(1.0		)	(1.0		)
Recognized actuarial losses (gains)	3.6			6.9			(1.2		)	(0.5		)	2.4			6.4
Net periodic benefit cost	$	8.4		$	11.4		$	(0.6	)	$	0.8		$	7.8		$	12.2