Commitment and Contingencies - Guarantee Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Loss Contingencies [Line Items]
Payment of guarantee liability	$ 1.2
Level 3 | Recurring
Loss Contingencies [Line Items]
Guarantee on certain obligations	$ 13.2	$ 12.0	$ 13.8