Pension and Other Post-Retirement Benefits (Tables)

6 Months Ended

Jun. 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 June 30, 2011 and 2010, were as follows (in millions):

							2011 Retiree			2010 Retiree
	2011 Pension			2010 Pension			Health and			Health and
	Benefits			Benefits			Life			Life
Service cost	$	1.2		$	1.4		$	0.1		$	0.1
Interest cost		5.2			5.5			0.6			0.6
Expected return on plan assets		(8.3	)		(8.3	)		—			—
Amortization of:
Unrecognized prior service credit		(0.2	)		(0.3	)		(0.1	)		—
Unrecognized net actuarial loss (gain)		1.6			1.7			(0.1	)		—
Net costs (a)	$	(0.5	)	$	—		$	0.5		$	0.7

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

							2011 Retiree			2010 Retiree
	2011 Pension			2010 Pension			Health and			Health and
	Benefits			Benefits			Life			Life
Service cost	$	2.7		$	2.8		$	0.1		$	0.2
Interest cost		10.4			11.0			1.1			1.2
Expected return on plan assets		(16.6	)		(16.6	)		—			—
Amortization of:
Unrecognized prior service credit		(0.5	)		(0.6	)		(0.1	)		—
Unrecognized net actuarial loss (gain)		3.6			3.4			(0.1	)		—
Net costs (a)	$	(0.4	)	$	—		$	1.0		$	1.4