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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Income Tax Disclosure [Abstract]        
Effective tax rate (as percent)   20.60% 23.60%  
Tax at federal statutory rate (as percent)   21.00% 21.00%  
Tax benefit related to income tax credits and incentives   $ 47.2 $ 46.1  
Tax expense related to foreign residual income   45.6 39.7  
Tax benefit related to deferred tax assets resulting from legal entity restructuring   20.1    
Tax expense related to state income taxes   19.6 18.2  
Exclusion of tax on non-controlling interests     8.4  
Tax expense related to valuation allowances     7.4  
Tax benefit related to an audit settlement     6.9  
Tax expense related to nondeductible expense, amount     $ 5.6  
Deferred tax assets resulting from legal entity restructuring       $ 20.1
Tax benefit due primarily to changes in uncertain tax positions $ 6.9      
Gross book-tax differences from non-U.S. subsidiaries   $ 1,200.0