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Retirement Benefit Plans (Percentage and Target Allocations) (Details) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 100.00% | 100.00%
Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 3.00% | 9.00%
Minimum Target Allocation | 0.00% | 0.00%
Maximum Target Allocation | 5.00% | 5.00%
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 41.00% | 36.00%
Minimum Target Allocation | 25.00% | 25.00%
Maximum Target Allocation | 65.00% | 65.00%
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 51.00% | 50.00%
Minimum Target Allocation | 30.00% | 30.00%
Maximum Target Allocation | 60.00% | 60.00%
Real Assets Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 5.00% | 5.00%
Minimum Target Allocation | 0.00% | 0.00%
Maximum Target Allocation | 10.00% | 10.00%

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