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Operations and Summary of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Investments in affiliates $ (436.9) $ (413.5)    
Stockholders' equity (3,882.6) (3,443.8) $ (3,018.0) $ (2,907.0)
Retained Earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Stockholders' equity $ (5,654.6) $ (5,182.2) $ (4,759.1) $ (4,443.5)