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 51 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2022
AUD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2022
AUD ($)
Tax Credit Carryforward [Line Items]            
Tax loss carry-forwards $ 66.2       $ 66.2  
Recognized tax deduction 144.8 $ 195.8        
Contribution to AICF 248.5   $ 153.3 $ 108.9 715.9 $ 979.1
Foreign tax credit carry-forwards 118.7   122.1   118.7  
Valuation allowance 261.2   $ 262.7   261.2  
Income tax paid, net of refunds 92.7          
Current taxes receivable, CARES Act 29.6       29.6  
Total amount of unrecognized tax benefits 0.7       0.7  
Interest and penalties recognized income tax expense 0.7          
Foreign Tax Credit Carry-Forwards            
Tax Credit Carryforward [Line Items]            
Foreign tax credit carry-forwards $ 113.9       $ 113.9  
Percentage of valuation allowance against foreign tax credit carry-forwards (as percent) 100.00%       100.00%  
Foreign tax credit carry-forwards, subject to expiration $ 4.8       $ 4.8  
Valuation allowance $ 4.0       $ 4.0