Background and Basis of Presentation - Allowance for Uncollectible Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts	$ 2.0		$ 1.5
Provision for impacts of COVID-19 pandemic	$ 1.0	$ 0.0