Pension and Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

Pension and Postretirement Benefit Plans (Tables) [Abstract]

Components of net periodic benefit cost

	For the Three Months Ended June 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			0.3			0.2
Expected return on plan assets		(4.8	)		(4.9	)		—			—
Amortization of prior service cost		0.1			0.1			(0.5	)		(0.5	)
Amortization of net loss		1.7			2.1			0.3			0.3
Settlements or curtailments		0.2			—			—			—
Total net periodic pension cost	$	3.0		$	3.0		$	0.3		$	0.2

	For the Six Months Ended June 30,
	2011			2010			2011			2010
	Pension Benefits						Other Benefits
Service cost	$	2.7		$	2.5		$	0.4		$	0.4
Interest cost		9.0			8.8			0.5			0.4
Expected return on plan assets		(9.5	)		(9.7	)		—			—
Amortization of prior service cost		0.2			0.2			(1.0	)		(1.0	)
Amortization of net loss		3.5			4.3			0.6			0.6
Settlements or curtailments		1.6			—			—			—
Total net periodic pension cost	$	7.5		$	6.1		$	0.5		$	0.4