Pension Plans and Other Postretirement Benefits (Details14) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Expected Future Benefit Payments In Year One	$ 190.1
Defined Benefit Plan Expected Future Benefit Payments In Year Two	190.8
Defined Benefit Plan Expected Future Benefit Payments In Year Three	191.3
Defined Benefit Plan Expected Future Benefit Payments In Year Four	191.9
Defined Benefit Plan Expected Future Benefit Payments In Year Five	191.9
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	956.7
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Expected Future Benefit Payments In Year One	74.9
Defined Benefit Plan Expected Future Benefit Payments In Year Two	54.9
Defined Benefit Plan Expected Future Benefit Payments In Year Three	53.4
Defined Benefit Plan Expected Future Benefit Payments In Year Four	49.9
Defined Benefit Plan Expected Future Benefit Payments In Year Five	47.5
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	197.3
Prescription Drug Subsidy Receipts Year One	1.5
Prescription Drug Subsidy Receipts Year Two	1.5
Prescription Drug Subsidy Receipts Year Three	1.5
Prescription Drug Subsidy Receipts Year Four	1.5
Prescription Drug Subsidy Receipts Year Five	1.5
PrescriptionDrugSubsidyReceiptsAfterYearFive	$ 6.5