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Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2022
Apr. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Class of Stock [Line Items]          
Aggregate purchase price     $ 871.7 $ 1,710.2 $ 2,303.2
Excise tax accrual on share repurchases     $ 8.1    
Common Stock [Member]          
Class of Stock [Line Items]          
Treasury stock cancellation, Shares 23,000,000 16,000,000   23,000,000 16,000,000
Stock Repurchase Program Board Authorized Repurchases [Member]          
Class of Stock [Line Items]          
Shares repurchased (in shares)     6,400,000 15,600,000 22,300,000
Aggregate purchase price     $ 863.6 $ 1,710.2 $ 2,303.2
Average purchase price per share (in dollars per share)     $ 134.68 $ 109.86 $ 103.18
Remaining amount available for share repurchase     $ 320.8