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Employee Retirement Plans - Summary of Plans' Weighted-Average Asset Targets and Actual Allocations as Percentage of Plan Assets (Details) | 12 Months Ended
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Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |
Target Allocations (as a percent) | 100.00%
Actual Allocations (as a percent) | 100.00%
Liability hedging |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocations (as a percent) | 24.70%
Actual Allocations (as a percent) | 25.50%
Equities |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocations (as a percent) | 27.70%
Actual Allocations (as a percent) | 32.10%
Hedge funds |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocations (as a percent) | 27.70%
Actual Allocations (as a percent) | 32.10%
Corporate bonds |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocations (as a percent) | 15.00%
Actual Allocations (as a percent) | 9.30%
Property |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocations (as a percent) | 4.90%
Actual Allocations (as a percent) | 1.00%
Other |
Defined Benefit Plan Disclosure [Line Items] |
Target Allocations (as a percent) | 0.00%
Actual Allocations (as a percent) | 0.00%

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