Pension and Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2011

Pension and Postretirement Benefit Plans [Abstract]

Components of net periodic benefit cost

	For the Three Months Ended September 30,
	2011			2010			2011			2010
	Pension Benefits						Other Benefits
Service cost	$	1.3		$	1.3		$	0.2		$	0.2
Interest cost		4.5			4.4			0.2			0.2
Expected return on plan assets		(4.7	)		(4.9	)		—			—
Amortization of prior service cost		0.1			0.1			(0.4	)		(0.5	)
Amortization of net loss		1.7			2.1			0.3			0.3
Settlements or curtailments		0.1			—			—			—
Total net periodic pension cost	$	3.0		$	3.0		$	0.3		$	0.2

	For the Nine Months Ended September 30,
	2011			2010			2011			2010
	Pension Benefits						Other Benefits
Service cost	$	4.0		$	3.7		$	0.6		$	0.4
Interest cost		13.5			13.2			0.7			0.6
Expected return on plan assets		(14.2	)		(14.5	)		—			—
Amortization of prior service cost		0.3			0.4			(1.4	)		(1.4	)
Amortization of net loss		5.2			6.4			0.9			0.9
Settlements or curtailments		1.7			—			—			—
Total net periodic pension cost	$	10.5		$	9.2		$	0.8		$	0.5