Pension and Other Post-Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2011

Pension and Other Post-Retirement [Abstract]

Components of pension and other post retirement benefit costs

The components of pension and other post-retirement benefit costs for the three months ended September 30, 2011 and 2010, were as follows (in millions):

	2011 Pension Benefits			2010 Pension Benefits			2011 Retiree Health and Life			2010 Retiree Health and Life
Service cost	$	1.4		$	1.2		$	0.1		$	(0.1	)
Interest cost		5.2			5.6			0.6			0.6
Expected return on plan assets		(8.4	)		(8.5	)		—			—
Amortization of:
Unrecognized prior service credit		(0.3	)		(0.2	)		—			(0.1	)
Unrecognized net actuarial loss (gain)		1.8			1.1			(0.1	)		(0.2	)
Net costs (a)	$	(0.3	)	$	(0.8	)	$	0.6		$	0.2

The components of pension and other post-retirement benefit costs for the nine months ended September 30, 2011 and 2010, were as follows (in millions):

	2011 Pension Benefits			2010 Pension Benefits			2011 Retiree Health and Life			2010 Retiree Health and Life
Service cost	$	4.1		$	4.0		$	0.2		$	0.1
Interest cost		15.6			16.6			1.7			1.8
Expected return on plan assets		(25.0	)		(25.1	)		—			—
Amortization of:
Unrecognized prior service credit		(0.8	)		(0.8	)		(0.1	)		(0.1	)
Unrecognized net actuarial loss (gain)		5.4			4.5			(0.2	)		(0.2	)
Net costs (a)	$	(0.7	)	$	(0.8	)	$	1.6		$	1.6

(a) The amounts reported herein are based on estimated annual costs. Actual annual costs for the year ending December 31, 2011, may differ from these estimates.