Other Income - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Income, Net
Capitalized interest cost	$ 0.2	$ 0.2	$ 0.3	$ 0.4
Senior Notes held by special purpose entity
Other Income, Net
Effective interest rate (as a percent)	4.90%		4.90%