Retirement and Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2012

Compensation and Retirement Disclosure [Abstract]

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

	Pension						Postretirement
	Three Months Ended June 30,						Three Months Ended June 30,
	2012			2011			2012			2011
Components of net periodic benefit cost
Service cost	$	8.4		$	7.9		$	0.5		$	0.7
Interest cost	37.8			39.6			6.7			7.5
Expected return on plan assets	(55.3		)	(57.5		)	(2.5		)	(1.5		)
Amortization of prior service cost (credit)	2.4			2.3			—			0.2
Amortization of net actuarial loss	20.5			15.2			0.2			0.5
Curtailment loss	10.7			—			—			—
Net periodic benefit cost	$	24.5		$	7.5		$	4.9		$	7.4

	Pension						Postretirement
	Six Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Components of net periodic benefit cost
Service cost	$	17.2		$	16.2		$	1.2		$	1.2
Interest cost	75.6			79.4			13.9			16.2
Expected return on plan assets	(110.5		)	(107.6		)	(5.3		)	(2.2		)
Amortization of prior service cost (credit)	4.7			4.7			(0.1		)	(0.2		)
Amortization of net actuarial loss	41.7			28.0			1.3			1.5
Curtailment loss	10.7			—			—			—
Net periodic benefit cost	$	39.4		$	20.7		$	11.0		$	16.5