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Share-based Payments (Details) - USD ($)
shares in Thousands, $ in Millions
2 Months Ended 3 Months Ended
Nov. 30, 2019
Nov. 30, 2019
Nov. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment expense   $ 16.7 $ 7.8
Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Performance share units outstanding (shares) 37 37  
Restricted Stock and Performance Share Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Minimum age for eligibility under retirement vesting provision 60 years    
Minimum service period under retirement vesting provision 10 years