Pension and Other Postretirement Benefits- Percentage Point Change (Details) (Other Postretirement Benefit Plan, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Effect on total of service and interest costs components, One Percent Increase	$ 0
Effect on total of service and interest cost components, One Percent Decrease	0
Effect on postretirement benefit obligation, One Percent Increase	5.0
Effect on postretirement benefit obligation, One Percent Decrease	$ (4.0)