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Related Parties - Polar - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Polar [Member]
Related Party Transaction [Line Items]
Revenue recognized	$ 83.1	$ 23.1	$ 110.5	$ 46.4
Polar [Member]
Related Party Transaction [Line Items]
Equity interest	51.00%		51.00%
Voting interest			75.00%
DHL [Member] \| Polar [Member]
Related Party Transaction [Line Items]
Equity interest	49.00%		49.00%
Voting interest			25.00%