Summary of Significant Accounting Policies, Shipping Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Shipping Costs [Abstract]
Shipping costs	$ 7.1	$ 5.3	$ 21.1	$ 17.4