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Pension Benefits - Schedule of Plan Assets Allocations (Details) - Pension Benefits | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range | 100.00% |  |
Plan Assets Percentage | 100.00% | 100.00% | 100.00%
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets Percentage | 51.00% | 51.00% | 58.00%
Equity Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range | 45.00% |  |
Equity Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range | 55.00% |  |
Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets Percentage | 38.00% | 39.00% | 33.00%
Debt Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range | 33.00% |  |
Debt Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range | 43.00% |  |
Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets Percentage | 11.00% | 10.00% | 9.00%
Real Estate | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range | 10.00% |  |
Real Estate | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range | 14.00% |  |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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