Annual and transition report of foreign private issuers pursuant to Section 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, 2023
USD ($)
Mar. 31, 2023
AUD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2023
AUD ($)
Tax Credit Carryforward [Line Items]            
Tax loss carry-forwards $ 75.4       $ 75.4  
Recognized tax deduction 137.4 $ 200.6        
Contribution to AICF 109.6   $ 248.5 $ 153.3 722.5 $ 1,002.8
Foreign tax credit carry-forwards 115.0   118.7   115.0  
Valuation allowance 258.0   $ 261.2   258.0  
Income tax paid, net of refunds 117.1          
Current taxes receivable, CARES Act 29.6       29.6  
Total amount of unrecognized tax benefits 0.9       0.9  
Interest and penalties recognized income tax expense 0.9          
Foreign Tax Credit Carry-Forwards            
Tax Credit Carryforward [Line Items]            
Foreign tax credit carry-forwards $ 111.3       $ 111.3  
Percentage of valuation allowance against foreign tax credit carry-forwards (as percent) 100.00%       100.00%  
Foreign tax credit carry-forwards, subject to expiration $ 3.7       $ 3.7  
Valuation allowance $ 2.1       $ 2.1