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Operations and Summary of Significant Accounting Policies (Cash and Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash $ 833.0 $ 1,022.0 $ 412.3  
Cash Equivalents 49.2 89.7 17.3  
Restricted Cash 6.9 7.4 3.2  
Total $ 889.1 $ 1,119.1 $ 432.8 $ 326.1