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Recent Authoritative Accounting Guidance (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]        
Stockholders' Equity Attributable to Parent $ 3,304.0 $ 3,227.5 $ 3,073.8 $ 1,986.6
Off-Balance Sheet, Credit Loss, Liability 5.2 18.4 16.2  
Retained Earnings [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Stockholders' Equity Attributable to Parent $ 1,166.4 $ 1,135.1 $ 1,072.7 $ 1,052.6