Employee Benefit Plans OPEB Plan Assets, Fair Value Measurements by Input Level (Details) (Other Postretirement Benefit Plans, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Life Settlement Contracts, Fair Value Method, Face Value	$ 11.4	$ 11.5
Fair Value, Inputs, Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Life Settlement Contracts, Fair Value Method, Face Value	0	0
Fair Value, Inputs, Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Life Settlement Contracts, Fair Value Method, Face Value	11.4	11.5
Fair Value, Inputs, Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Life Settlement Contracts, Fair Value Method, Face Value	$ 0	$ 0