v3.26.1
Fair Value Measurements - Non-Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Feb. 29, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of goodwill $ 0.0 $ 0.0 $ 34.8
Goodwill impairment loss - disc. op   0.0 18.9
Goodwill impairment loss continuing operations     15.9
Impairment of long-lived assets (note 4) 2.1 9.6 15.3
Impairment Of Right of Use Assets 1.2 6.9 6.9
Patent Abandonment, Cost     15.3
Patent Abandonment, Accumulated Amortization     7.5
Patent Abandonment classified as impairment of LLA, Net Book Value     7.8
Impairment Of Right of Use Asset and related Property, Plant and Equipment     7.5
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount 1.8 1.2  
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount   2.4  
Impairment on non-marketable equity investments without readily determinable fair value 2.3 0.2 0.0
Property, Plant and Equipment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of long-lived assets (note 4) 0.9 2.7 $ 0.6
Other Intangible Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of long-lived assets (note 4) $ 0.4 $ 0.5