Employee Benefit Plans - Schedule of Pension Plan Asset and Target Allocation (Details) - Pension Benefits	Sep. 30, 2020
Asset Category
Total assets (as a percent)	100.00%
Fixed income
Asset Category
Total assets (as a percent)	47.00%
Large-cap Equity
Asset Category
Total assets (as a percent)	24.00%
Mid-cap Equity
Asset Category
Total assets (as a percent)	11.00%
Small-cap Equity
Asset Category
Total assets (as a percent)	7.00%
Global Equity
Asset Category
Total assets (as a percent)	7.00%
Other
Asset Category
Total assets (as a percent)	4.00%
Minimum | Fixed income
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	40.00%
Minimum | Large-cap Equity
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	20.00%
Minimum | Mid-cap Equity
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	5.00%
Minimum | Small-cap Equity
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	5.00%
Minimum | Global Equity
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	5.00%
Minimum | Other
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	0.00%
Maximum | Fixed income
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	50.00%
Maximum | Large-cap Equity
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	30.00%
Maximum | Mid-cap Equity
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	15.00%
Maximum | Small-cap Equity
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	10.00%
Maximum | Global Equity
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	10.00%
Maximum | Other
Asset Category
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	10.00%