Leases - Operating Lease Cost and Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease costs	$ 16.1	$ 21.4	$ 28.1
Variable lease costs	8.0	5.8	5.1
Short-term lease costs	1.0	1.3	1.6
Sublease income	(3.1)	(3.4)	(2.4)
Total lease costs	$ 22.0	$ 25.1	$ 32.4