Annual and transition report of foreign private issuers [Sections 13 or 15(d)]

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details)
$ in Millions, $ in Millions
12 Months Ended 48 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2025
AUD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2025
AUD ($)
Tax Credit Carryforward [Line Items]            
Tax loss carry-forwards $ 77.4       $ 77.4  
Operating loss carryforwards, valuation allowance 0.6       0.6  
Recognized tax deduction 129.8 $ 198.9        
Contribution to AICF 99.2   $ 91.8 $ 109.6 702.4 $ 994.7
Foreign tax credit carry-forwards 111.8   113.4   111.8  
Valuation allowance 256.9   $ 257.0   256.9  
Income tax paid, net of refunds 128.1          
Current taxes receivable, CARES Act 37.7       37.7  
Total amount of unrecognized tax benefits 2.3       2.3  
Interest and penalties recognized income tax expense 2.3          
Foreign Tax Credit Carry-Forwards            
Tax Credit Carryforward [Line Items]            
Foreign tax credit carry-forwards $ 108.1       $ 108.1  
Percentage of valuation allowance against foreign tax credit carry-forwards (as percent) 100.00%       100.00%  
Foreign tax credit carry-forwards, subject to expiration $ 3.3       $ 3.3  
Valuation allowance $ 2.8       $ 2.8