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Stock Based Compensation Plans (Summary of Stock Options Activity) (Details) - Equity Option [Member] - USD ($)
$ / shares in Units, $ in Millions
 7 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, as of December 31   682,074 705,749
Granted 770,500 67,000  
Exercised   (44,550)  
Forfeited   46,125  
Options Outstanding, as of December 31, Weighted Average Exercise Price   $ 365.34 $ 350.74
Options Granted, Weighted Average Exercise Price   501.50  
Options Exercised, Weighted Average Exercise Price   340.35  
Options Forfeited, Weighted Average Exercise Price   $ (363.75)  
Options Outstanding, Intrinsic Value [1]   $ 77.4  
Options Outstanding, Weighted Average Remaining Contractual Term   4 years 10 months 24 days  
Options Exercisable, Number   244,454  
Options Exercisable, Weighted Average Exercise Price   $ 344.89  
Options Exercisable, Intrinsic Value [1]   $ 31.8  
Options Exercisable, Weighted Average Remaining Contractual Term   4 years 6 months  
Options, Nonvested, Number   437,620  
Options Nonvested, Weighted Average Exercise Price   $ 376.77  
Options, Nonvested, Aggregate Intrinsic Value [1]   $ 45.6  
Options Nonvested, Weighted Average Remaining Contractual Term   5 years 1 month 6 days  
[1] The intrinsic value of stock options is the amount by which the market price of the stock as of December 31, 2022 exceeded the exercise price of the options