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Contingencies - Narrative (Details)
R$ in Millions
 1 Months Ended
Apr. 26, 2015
Jan. 13, 2014
USD ($)
Dec. 23, 2013
USD ($)
Dec. 21, 2013
USD ($)
Jan. 24, 2013
USD ($)
Aug. 11, 2011
USD ($)
Apr. 30, 2018
USD ($)
Apr. 30, 2018
BRL (R$)
Aug. 31, 2011
USD ($)
Apr. 30, 2011
USD ($)
trade_secret
Jan. 31, 2010
USD ($)
Jun. 30, 2006
Case
Apr. 30, 1999
USD ($)
Sep. 30, 2018
USD ($)
Nov. 11, 2014
USD ($)
Jul. 26, 2013
USD ($)
Dec. 31, 2012
USD ($)
Apr. 27, 2009
USD ($)
Jul. 17, 2008
USD ($)
MGA                                      
Loss Contingencies [Line Items]                                      
Number of cases combined | Case                       3              
Historical jury verdict                                   $ 100,000,000 $ 100,000,000
Number of claimed trade secrets | trade_secret                   26                  
Compensatory damages awarded by jury                   $ 88,500,000                  
Number of other claimed trade secrets | trade_secret                   88                  
Reduced compensatory damages awarded by court                 $ 85,000,000                    
Punitive damages awarded                 85,000,000                    
Attorney fees and costs awarded                 140,000,000                    
Compensatory damages, punitive damages, and attorney fees and costs awarded by court                 $ 310,000,000                    
Damages for alleged trade secret misappropriation appealed           $ 170,000,000                          
Attorney fees and costs appealed           $ 140,000,000                          
Amount of damages and attorney's fees and costs vacated by the appeals court         $ 172,500,000                            
Litigation accrual                                 $ 138,000,000    
Approximate amount of judgment finalized in the District Court, including interest       $ 138,000,000                              
Payment of judgment     $ 138,000,000                                
Accrued litigation liability                           $ 0          
Yellowstone                                      
Loss Contingencies [Line Items]                                      
Alleged loss of profits                         $ 1,000,000            
Unpaid accounts receivable                         4,000,000            
Alleged business investments                         3,000,000            
Initial estimate of loss of profits                         $ 1,000,000            
Court awarded damages from counterclaim                     $ 4,000,000                
Damages awarded, including attorney fees, inflation and interest                               $ 17,000,000      
Counter claim awarded, including inflation                             $ 7,500,000 $ 7,500,000      
Damages award including inflation and interest                             $ 14,500,000        
Fine on claims (as a percent) 1.00%                                    
Settlement agreement amount             $ 1,300,000 R$ 5.0                      
Minimum | MGA                                      
Loss Contingencies [Line Items]                                      
Alleged trade secrets damages claimed (more than)   $ 1,000,000,000