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Stockholders' Equity - Exchangeable Shares and Share Repurchase Program (Details)
shares in Millions, $ in Millions
12 Months Ended
Nov. 30, 2018
USD ($)
Jun. 01, 2018
shares
Apr. 30, 2019
USD ($)
shares
Exchangeable Shares and Share Repurchase Program      
Number of shares repurchased | shares     1.0
Shares repurchased, cost     $ 16.5
Remaining amount under repurchase program     $ 58.5
Maximum      
Exchangeable Shares and Share Repurchase Program      
Shares repurchased, cost $ 75.0    
Titan      
Exchangeable Shares and Share Repurchase Program      
Issuance of shares to current shareholders of Titan (in shares) | shares   1.1  
Exchangeable shares conversion ratio   1  
Duration which stock can not be transferred   1 year