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Share-Based Compensation (Narrative) (Details)
shares in Thousands, $ in Millions
2 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
grantees
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-Based Payment Arrangement, Plan Modification, Number of Grantees Affected | grantees   4    
Total share-based compensation expense   $ 121.0 $ 121.0 $ 96.0
Tax benefit related to share-based compensation   14.0 16.0 12.0
Total expense on employee retirement savings plans   89.0 65.0 66.0
Share-Based Payment Arrangement, Plan Modification, Incremental Cost   9.0    
Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense   50.0 44.0 32.0
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 47.0 $ 46.0 $ 38.0
Weighted-average period over which stock option compensation cost is expected to be recognized   2 years 2 years 2 years
Performance Share Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target performance goal (as a percent)   240.00%    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) | shares   0 0 0
GIA Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense $ 123.0 $ 41.0    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 339.0    
Weighted-average period over which stock option compensation cost is expected to be recognized   2 years    
Share-Based Payment Arrangement, Acquisition Related Expense 120.0      
Share-Based Payment Arrangement, Non-Acquisition-Related Expense $ 3.0      
2021 LTIP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant | shares   15,000    
2021 LTIP [Member] | Awards Other than Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant | shares   6,000    
2021 LTIP [Member] | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant | shares   15,000