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Provision for Taxes (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Components of Deferred Tax Assets and Liabilities [Abstract]      
Statutory federal income tax rate 21.00% 21.00% 21.00%
Tax adjustment settlements and unusual provisions $ 11.4    
NOL and credit carryforwards, federal amount 129.0    
NOL to expire, credit 628.9 $ 480.0  
Provisional benefit amount 64.8 45.9  
Provisional tax expense for foreign tax credits 20.2 12.2  
Phase three tax, increase in income tax expense 8.0    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]      
Unrecognized tax benefits, income tax penalties and interest accrued 9.6 $ 17.7  
Unrecognized tax benefits, income tax penalties and interest expense $ 8.1