Commitments and Contingencies - Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 46.6	$ 48.4
Variable lease cost	11.9	10.0
Total lease cost	58.5	58.4
Operating cash outflows from operating leases	51.6	53.1
ROU assets obtained in exchange for new operating lease liabilities	$ 12.4	$ 26.0
Weighted average remaining lease term (years)	3 years 7 months 6 days	4 years 1 month 6 days
Weighted average discount rate	3.80%	3.50%