Commitment and Contingencies - Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 28.1	$ 27.5
Variable lease cost	3.9	5.0
Short-term lease cost	4.2	3.1
Total lease cost	$ 36.2	$ 35.6