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Shareholders' Equity (Shares Repurchased Under Stock Repurchase Program) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Apr. 23, 2025
Mar. 31, 2025
Mar. 31, 2024
Class of Stock [Line Items]      
Aggregate purchase price   $ 226.6 $ 38.8
Excise tax accrual on share repurchases   $ 1.8 $ 0.1
Stock Repurchase Program Board Authorized Repurchases      
Class of Stock [Line Items]      
Shares repurchased (in shares)   1.4 0.2
Aggregate purchase price [1]   $ 224.8 $ 38.7
Average purchase price per share (in dollars per share)   $ 164.95 $ 158.40
Remaining amount available for share repurchase   $ 636.0  
Stock Repurchase Program Board Authorized Repurchases | Subsequent Event      
Class of Stock [Line Items]      
Shares repurchased (in shares) 0.2    
Aggregate purchase price $ 28.9    
Average purchase price per share (in dollars per share) $ 157.57    
[1]
(1) Excludes the excise tax imposed under the Inflation Reduction Act of $1.8 million and $0.1 million for the three months ended March 31, 2025, and March 31, 2024, respectively.