Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.19.1
Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 30, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                
Unrecognized tax benefit liabilities   $ 93.7       $ 239.0 $ 93.7  
Unrecognized tax benefits that would impact effective tax rate if recognized   89.3       224.3 89.3  
Provisional net income tax benefit related to the Tax Cuts and Jobs Act   $ (351.2) $ 0.0 $ 0.0 $ 0.0   (351.2) $ 0.0
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  
Measurement period adjustment, Net income tax benefit related to the Tax Cuts and Jobs Act $ (37.6)         (37.6)    
Undistributed earnings of foreign subsidiaries expected to be indefinitely reinvested               $ 420.0
Operating loss carryforwards           833.3    
Operating loss carryforwards subject to expiration           745.5    
Operating loss carryforwards not subject to expiration           87.8    
Federal capital losses subject to expiration           222.3    
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    
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           $ 13.0