Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.21.1
Income Taxes - Narrative (Details) - USD ($)
$ in Millions
Feb. 28, 2021
Feb. 29, 2020
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Operating loss carryforwards $ 1,600.0  
Operating loss carryforwards subject to expire by fiscal 2027 1,200.0  
Operating loss carryforwards subject to expire between fiscal 2028 and fiscal 2041 344.1  
Operating loss carryforwards not subject to expiration 92.5  
Federal capital losses subject to expiration 168.1  
Unrecognized tax benefit liabilities 268.9 $ 276.2
Unrecognized tax benefit liabilities that would impact effective tax rate if recognized 236.1 $ 249.4
Minimum    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Estimate of change in unrecognized tax benefit liabilities reasonably possible as a result of examination or expiration of statutes of limitation 1.0  
Maximum    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Estimate of change in unrecognized tax benefit liabilities reasonably possible as a result of examination or expiration of statutes of limitation $ 8.0