Benefits (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amounts recognized in Consolidated Balance Sheets
Other long-term liabilities	$ 173,200,000	$ 244,000,000
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	1,409,500,000	1,507,100,000
Defined Benefit Plan, Benefit Obligation	1,410,200,000	1,508,500,000	1,330,600,000
Change in Plan Assets
Fair Value at January 1	1,385,400,000	1,262,500,000
Actual earnings (loss) on plan assets	147,300,000	127,400,000
Employer contributions	8,700,000	102,700,000
Participants' contributions	0	0
Gross benefits paid	(90,400,000)	(107,200,000)
Fair Value at December 31	1,451,000,000	1,385,400,000
Amounts recognized in Consolidated Balance Sheets
Other deferred charges	138,700,000	0
Other long-term liabilities	97,900,000	123,100,000
Net Liability	40,800,000	(123,100,000)
Amounts not yet been recognized in net periodic benefit cost
Net actuarial loss	528,800,000	719,200,000
Prior service costs (credits)	8,800,000	12,200,000
Total	537,600,000	731,400,000
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	362,700,000	381,200,000	389,700,000
Change in Plan Assets
Fair Value at January 1	285,400,000	255,400,000
Actual earnings (loss) on plan assets	45,500,000	29,000,000
Employer contributions	14,100,000	17,700,000	48,400,000
Participants' contributions	8,900,000	9,600,000
Gross benefits paid	(26,300,000)	(26,300,000)
Fair Value at December 31	327,600,000	285,400,000	255,400,000
Amounts recognized in Consolidated Balance Sheets
Other deferred charges	40,200,000	25,100,000
Other long-term liabilities	75,300,000	120,900,000
Net Liability	(35,100,000)	(95,800,000)
Amounts not yet been recognized in net periodic benefit cost
Net actuarial loss	9,800,000	65,300,000
Prior service costs (credits)	(1,700,000)	(3,700,000)
Total	$ 8,100,000	$ 61,600,000