Employee Benefit Plans - Expected long-term return by asset category (Details)	12 Months Ended
	Dec. 31, 2023
Growth assets
Expected Long Term Return [Abstract]
Expected long-term return	7.50%
Asset allocation [Abstract]
Asset allocation	50.00%
Hedging assets
Expected Long Term Return [Abstract]
Expected long-term return	4.10%
Asset allocation [Abstract]
Asset allocation	35.00%
Cash
Expected Long Term Return [Abstract]
Expected long-term return	5.30%
Asset allocation [Abstract]
Asset allocation	15.00%