Other Income, Net - Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income, Net
Capitalized interest cost	$ 1.1	$ 0.6	$ 0.2
Senior Notes held by special purpose entity
Other Income, Net
Effective interest rate (as a percent)	4.90%