Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Interest cost capitalized	$ 55.2	$ 49.7	$ 54.8
Advertising costs	$ 3.3	$ 1.7	$ 2.0