Commitments and Contingencies - Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 50.3
Variable lease cost	12.6
Total lease cost	62.9
Operating cash outflows from operating leases	49.6
ROU assets obtained in exchange for new operating lease liabilities	$ 14.0
Weighted average remaining lease term (years)	5 years 6 months
Weighted average discount rate	3.90%