Lease Commitments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lease Commitments
Lease expiration date	2032
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Lease cost	$ 93.4	$ 92.0	$ 97.4
Lease terminations	$ (29.4)