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Operations and Summary of Significant Accounting Policies (Interest Expense, Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Interest expense	$ 68.8	$ 46.0	$ 25.4
Interest income	(64.2)	(33.0)	(18.7)
Interest expense, net	$ 4.6	$ 13.0	$ 6.7

Amount of the cost of borrowed funds accounted for as interest expense.

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.