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Provision for Taxes (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Components of Deferred Tax Assets and Liabilities [Abstract]    
NOL and credit carryforwards, federal amount $ 146.0  
NOL and credit carryfowards, state amount 366.0  
Provisional benefit amount 243.0  
Deferred tax assets, effect of Tax Cuts and Jobs Act, tax expense (benefit) 458.5  
Reclassified amount from accumulated other comprehensive income to retained earnings   $ 384.9
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]    
Unrecognized tax benefits, income tax penalties and interest accrued 15.7 $ 14.3
Unrecognized tax benefits, income tax penalties and interest expense $ 1.4