Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2012

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
	2012			2011			2012		2011		2012			2011
Service cost	$	2.1		$	2.1		$	0.3	$	0.3	$	2.4		$	2.4
Interest cost	3.7			4.1			0.3		0.3		4.0			4.4
Expected return on assets	(4.0		)	(4.1		)	—		—		(4.0		)	(4.1		)
Amortization of prior service credit	(0.3		)	(0.3		)	—		—		(0.3		)	(0.3		)
Recognized actuarial losses	1.9			1.7			—		—		1.9			1.7
Curtailment gain, net	—			(0.2		)	—		—		—			(0.2		)
Net periodic benefit cost	$	3.4		$	3.3		$	0.6	$	0.6	$	4.0		$	3.9

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
	2012			2011			2012		2011		2012			2011
Service cost	$	6.7		$	7.0		$	1.0	$	0.9	$	7.7		$	7.9
Interest cost	11.4			12.1			0.7		0.7		12.1			12.8
Expected return on assets	(12.2		)	(12.1		)	—		—		(12.2		)	(12.1		)
Amortization of transition obligation	0.1			0.1			—		—		0.1			0.1
Amortization of prior service credit	(1.1		)	(1.2		)	0.1		0.1		(1.0		)	(1.1		)
Recognized actuarial losses	6.2			4.6			—		—		6.2			4.6
Curtailment gain, net	—			(0.2		)	—		—		—			(0.2		)
Net periodic benefit cost	$	11.1		$	10.3		$	1.8	$	1.7	$	12.9		$	12.0