Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Details Textual)

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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2009
Tax Credit Carryforward [Line Items]        
Income Tax Expense (Benefit) $ (453.2) $ 443.6 $ 66.2  
Income Taxes (Textual) [Abstract]        
Decrease in valuation allowance 1.0      
Income tax expense (benefit) due to tax audit settlements and statute of limitations expiration 0.5    2.2  
Period for the amount of unrecognised tax benefits increase or decrease next 12 months      
Interest and penalties recognised in tax expense 6.1 195.6    
Total amount of unrecognised tax benefits 2.6 185.5 7.7 12.3
Total amount of interest and penalties accrued 0.9 196.3 (26.9) (16.0)
Australia [Member]
       
Tax Credit Carryforward [Line Items]        
Capital Loss Carry-forwards 115.1      
Percentage of valuation allowance against loss carry forwards 100.00%      
USA [Member]
       
Tax Credit Carryforward [Line Items]        
Tax loss carry-forwards 7.4      
Income Tax Expense (Benefit) 5.8      
European [Member]
       
Tax Credit Carryforward [Line Items]        
Tax loss carry-forwards 28.9      
Percentage of valuation allowance against loss carry forwards 100.00%      
Tax loss carry-forwards available to offset future taxable income not subject to Expiration 23.3      
Operating loss carryforwards subject to expiration 5.6      
Non-Irish Subsidiaries [Member]
       
Tax Credit Carryforward [Line Items]        
Undistributed foreign earnings $ 236.9