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Operations and Summary of Significant Accounting Policies (Cash and Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash	$ 463.8	$ 656.7	$ 833.0
Cash Equivalents	131.2	130.8	49.2
Restricted cash	0.5	2.0	6.9
Total	$ 595.5	$ 789.5	$ 889.1	$ 1,119.1

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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