Retirement Benefits (Details 13) - Pension Benefits [Member]	12 Months Ended
	Dec. 31, 2018
Minimum [Member] | Global Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	.3
Minimum [Member] | Global debt securities and cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	.15
Minimum [Member] | Private equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	0
Minimum [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	.10
Minimum [Member] | Real estate and other [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	0
Maximum [Member] | Global Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	.6
Maximum [Member] | Global debt securities and cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	.4
Maximum [Member] | Private equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	.15
Maximum [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	.2
Maximum [Member] | Real estate and other [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	0.1