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Operations and Summary of Significant Accounting Policies (Cash and Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]        
Cash $ 342.5 $ 463.8 $ 656.7  
Cash Equivalents 269.5 131.2 130.8  
Restricted cash 0.7 0.5 2.0  
Total $ 612.7 $ 595.5 $ 789.5 $ 889.1