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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
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%