Retirement Plans (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Gain on curtailment	$ 38,700,000		$ 38,700,000	$ 400,000
Reduction in its pension liability due to curtailment	61,600,000
Plan amendments		81,500,000
Defined benefit plan, accumulated benefit obligation	3,901,700,000		3,901,700,000	3,512,900,000
Prescription drug subsidy receipts, year one	1,500,000		1,500,000
Threshold for recognition in net periodic benefit costs, percentage of projected benefit obligation or fair value of plan assets			10.00%
Employer matching contributions rate			40.00%
Maximum participant contributions as a percentage of eligible compensation per pay period	6.00%		6.00%
Multi-employer plan, period contributions			1,700,000	1,700,000	1,900,000
Percentage of employer contribution, maximum			5.00%	5.00%	5.00%
Restructuring charges			136,300,000	65,400,000
Target asset allocation percentage, equity and other securities			75.00%
Target asset allocation percentage, fixed income			25.00%
Red zone status, percentage			65.00%
Yellow zone status, percentage			80.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Gain on curtailment			38,700,000	400,000
Plan amendments			(500,000)	3,300,000
Expected cash contributions	216,100,000		216,100,000
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation arrangement with individual, requisite service period (in years)			two
Plan amendments			(72,400,000)
Expected cash contributions	4,700,000		4,700,000
Medicare reimbursements			3,300,000	3,300,000
Multi-Employer Pension Withdrawal Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges			$ 15,100,000	$ 13,600,000	$ 0