Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.20.1
Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2019
Nov. 30, 2018
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                
Unrecognized tax benefit liabilities $ 276.2         $ 276.2 $ 239.0  
Unrecognized tax benefits that would impact effective tax rate if recognized 249.4         249.4 224.3  
Net income tax benefit recognized in connection with tax reform in Switzerland 0.0 $ (547.4) $ 0.0 $ 0.0   (547.4)    
Net income tax benefit related to the Tax Cuts and Jobs Act               $ (351.2)
Benefit from remeasurement of deferred tax assets and liabilities to new rate               (311.2)
Benefit from reversal of deferred tax liabilities previously provided for unremitted earnings of foreign subsidiaries               220.0
Transition tax provision on unremitted earnings of foreign subsidiaries               $ 180.0
Net income tax benefit related to the Tax Cuts and Jobs Act         $ (37.6) 0.0 $ (37.6)  
Operating loss carryforwards 1,500.0         1,500.0    
Operating loss carryforwards subject to expiration 1,400.0         1,400.0    
Operating loss carryforwards not subject to expiration 87.4         87.4    
Federal capital losses subject to expiration 173.2         173.2    
Minimum [Member]                
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                
Estimate of change in unrecognized tax benefit liability reasonably possible as a result of examination or expiration of statutes of limitation 1.0         1.0    
Maximum [Member]                
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                
Estimate of change in unrecognized tax benefit liability reasonably possible as a result of examination or expiration of statutes of limitation $ 19.0         $ 19.0