Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Credit Loss [Abstract]
Accounts receivable, allowance for credit loss, incremental increase (decrease) due to COVID	$ 0.0	$ 0.0	$ 0.0	$ 2.5