Retirement and Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

Retirement and Postretirement Benefit Plans (Tables) [Abstract]

Net periodic benefit cost for the Company's retirement and postretirement benefit plans

	Pension						Postretirement
	Three Months Ended						Three Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Components of net periodic benefit cost
Service cost	$	7.9		$	7.0		$	0.7		$	0.4
Interest cost		39.6			39.3			7.5			8.4
Expected return on plan assets		(57.5	)		(50.8	)		(1.5	)		—
Amortization of prior service cost (credit)		2.3			2.4			0.2			(0.4	)
Amortization of net actuarial loss		15.2			13.7			0.5			0.7
Net periodic benefit cost	$	7.5		$	11.6		$	7.4		$	9.1

	Pension						Postretirement
	Six Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Components of net periodic benefit cost
Service cost	$	16.2		$	16.5		$	1.2		$	1.1
Interest cost		79.4			79.0			16.2			17.5
Expected return on plan assets		(107.6	)		(100.1	)		(2.2	)		—
Amortization of prior service cost (credit)		4.7			4.7			(0.2	)		(0.7	)
Amortization of net actuarial loss		28.0			25.9			1.5			2.0
Net periodic benefit cost	$	20.7		$	26.0		$	16.5		$	19.9