Allowance for Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Provision for (release of) credit losses	$ (7.8)	$ 14.5
Net charge-offs	$ 10.4	2.9
Time period used for projecting future conditions to estimate credit losses	2 years
Other financial assets, allowance for credit loss	$ 1.0	$ 1.0	$ 0.9	$ 0.8