Employee Benefits - Schedule of Reconciliation of Changes in Benefit Obligation and Fair value of Plan Assets As Well As the Funded Status Recognized in the Consolidated Statements (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Participants contributions	$ 0.8	$ 0.7