Retirement Benefits (Details 9)	12 Months Ended
	Dec. 31, 2013
Minimum | Domestic Equity Securities
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Asset allocation ranges, minimum	10.00%
Minimum | International equities
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Asset allocation ranges, minimum	5.00%
Minimum | Fixed Income Securities
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Asset allocation ranges, minimum	30.00%
Minimum | Alternative Investments
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Asset allocation ranges, minimum	15.00%
Maximum | Domestic Equity Securities
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Asset allocation ranges, maximum	30.00%
Maximum | International equities
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Asset allocation ranges, maximum	25.00%
Maximum | Fixed Income Securities
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Asset allocation ranges, maximum	50.00%
Maximum | Alternative Investments
Plan Asset Allocation Ranges (Table Amounts) [Abstract]
Asset allocation ranges, maximum	30.00%