Pension Plans and Other Postretirement Benefits (Details18) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial loss	$ 119.7
Defined Benefit Plan Amortization Of Net Prior Service Cost Credit	(11.8)
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year, Total	107.9
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial loss	105.2
Defined Benefit Plan Amortization Of Net Prior Service Cost Credit	6.4
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year, Total	111.6
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial loss	14.5
Defined Benefit Plan Amortization Of Net Prior Service Cost Credit	(18.2)
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year, Total	$ (3.7)