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Commitments and Contingencies (Details)
AUD in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 19, 2016
AUD
Apr. 30, 2013
AUD
investment
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jan. 28, 2016
employee
Aug. 31, 2015
employee
shareholder
Jun. 30, 2012
Shareholder Derivative Action              
Loss Contingencies [Line Items]              
Number of shareholders commencing punitive derivative action | shareholder           2  
City of Swan              
Loss Contingencies [Line Items]              
Number of synthetic collateralized debt obligations | investment   8          
Damages sought   AUD 327          
Settlement amount payable AUD 144            
CME Group | S&P DJ Indices              
Loss Contingencies [Line Items]              
Revenues earned under license agreement | $     $ 18 $ 40      
Noncontrolling interest ownership by noncontrolling owners             27.00%
S&P Global Ratings | Shareholder Derivative Action              
Loss Contingencies [Line Items]              
Number of former employees named as defendants | employee         9 3