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Operations and Summary of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect to stockholders' equity $ (3,742.8) $ (4,656.8) $ (3,882.6) $ (3,443.8)
Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect to stockholders' equity     5.5  
Retained Earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect to stockholders' equity $ (5,645.0) $ (6,360.0) (5,654.6) $ (5,182.2)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect to stockholders' equity     $ 5.5