Weichai Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Equity [Abstract]
Purchased inventory	$ 3.2	$ 4.1	$ 9.9	$ 16.3
Outstanding payables	$ 10.1		$ 10.1		$ 4.0