Employee Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Benefit Expense (Income) (Details) - Pension Plans	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted Average Assumptions Used to Determine Net Periodic Benefit Expense (Income)
Discount rate (as a percent)	3.08%	4.01%	3.46%
Expected long-term rate of return on plan assets (as a percent)	2.35%	3.52%	3.50%
Rate of future compensation increases (as a percent)	3.28%	3.34%	3.38%