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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 2.8 $ 5.4
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted 0.2 0.2
Grant date fair value $ 85.84 $ 62.61
Awards vesting period 3 years  
Performance Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares vested 0.2 0.3
Shares granted 0.3  
Grant date fair value $ 82.23  
Awards vesting period 3 years  
Shares will vest if defined maximum performance targets are met 1.1  
Shares will vest if defined maximum performance targets are not met 0.0  
Performance Share Units [Member] | Tranche One [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance target range 0.00%  
Performance Share Units [Member] | Tranche Two [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance target range 250.00%