Pension and Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Pension and Postretirement Benefit Plans [Abstract]

Components of net periodic benefit cost

	For the Three Months Ended March 31,
	2012			2011			2012			2011
	Pension Benefits						Other Benefits
Service cost	$	1.4		$	1.4		$	0.3		$	0.2
Interest cost		4.3			4.5			0.2			0.2
Expected return on plan assets		(4.7	)		(4.8	)		—			—
Amortization of prior service cost		0.1			0.1			(0.5	)		(0.5	)
Amortization of net loss		2.2			1.7			0.3			0.3
Settlements or curtailments		—			1.5			—			—
Total net periodic pension cost	$	3.3		$	4.4		$	0.3		$	0.2