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

Stock-Based Compensation (Details Textual)

v2.4.0.6
Stock-Based Compensation (Details Textual)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2012
USD ($)
Y
Mar. 31, 2012
AUD
Mar. 31, 2011
USD ($)
Mar. 31, 2011
AUD
Mar. 31, 2010
USD ($)
Mar. 31, 2010
AUD
Mar. 31, 2012
2001 Equity Incentive Plan [Member]
Mar. 31, 2011
2001 Equity Incentive Plan [Member]
Aug. 31, 2007
Long-Term Incentive Plan [Member]
Nov. 30, 2006
Long-Term Incentive Plan [Member]
Mar. 31, 2012
Long-Term Incentive Plan [Member]
Mar. 31, 2012
Long-Term Incentive Plan [Member]
Jun. 07, 2011
Restricted Stock Units Performance Vesting [Member]
Jun. 07, 2010
Restricted Stock Units Performance Vesting [Member]
Dec. 07, 2011
Restricted Stock Units Service Vesting [Member]
Dec. 07, 2010
Restricted Stock Units Service Vesting [Member]
Dec. 07, 2009
Restricted Stock Units Service Vesting [Member]
May 29, 2009
Restricted Stock Units Service Vesting [Member]
Dec. 17, 2008
Restricted Stock Units Service Vesting [Member]
Sep. 15, 2011
Restricted Stock Units Market Condition [Member]
Sep. 15, 2010
Restricted Stock Units Market Condition [Member]
Dec. 17, 2008
Restricted Stock Units Market Condition [Member]
Sep. 15, 2008
Restricted Stock Units Market Condition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                              
Issue of shares authorised             45,077,100                                
Percentage of options exercised after first year             25.00%                                
Percentage of options exercised after second year             25.00%                                
Percentage of options exercised after third year             50.00%                                
Unexercised option expiration year             10 years         10 years                      
Unexercised option expiration days             90 days                                
Restricted stock units outstanding 3,677,511 3,677,511 5,112,095 5,112,095 4,736,721 4,736,721 617,316       3,060,195 3,060,195                      
Restricted stock units granted 1,303,209 1,303,209 2,107,077 2,107,077     285,358 348,426             281,556         954,705 951,194    
Granted options 0 0 0 0 0 0     1,016,000 1,132,000                          
Options outstanding                     1,760,600                        
Closing stock price   7.68                                          
Restricted stocks units vested 2,527,601 2,527,601 970,793 970,793                       81,619 55,404 925,024 316,283     385,288 760,037
Cash settled units (service vesting)             2,488 450                              
Restricted stock units granted under the LTIP                       6,116,375 63,146 807,457                  
Stock-Based Compensation (Textual) [Abstract]                                              
Stock-based compensation expense $ 11.1   $ 11.3   $ 9.3                                    
Compensation expense related to equity based awards 7.8   9.1   7.7                                    
Compensation expense related to liability based awards 3.3   2.2   1.6                                    
Unrecognized compensation cost related to share based compensation cost 8.8                                            
Estimated weighted average amortization, period of recognition 2.5 2.5                                          
Intrinsic value of stock option exercised   2.0   0.6   4.7                                  
Tax benefit from stock options exercised      $ 0.4   $ 0.9                                    
Restricted stock unit deferred vesting period 2 years 2 years                                          
Scorecard LTI - cash settled units granted under the terms of LTIP 716,536 716,536 821,459 821,459