Letters of Credit (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Amount outstanding at period end	$ 40.0	$ 0.0
Letter of Credit
Line of Credit Facility [Line Items]
Amount outstanding at period end	$ 2.0	$ 2.0
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Letters of Credit, Term	1 year