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Cash, Cash Equivalents and Investments - Components of Cash, Cash Equivalents and Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Nov. 30, 2025
Nov. 30, 2024
Feb. 28, 2025
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis $ 372.1   $ 372.1   $ 415.4
Unrealized Gains     6.6   6.1
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount 1.8   1.8 $ 1.2  
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount   $ (2.4)      
Unrealized Losses     (1.2)   (11.2)
Fair Value 377.5   377.5   410.3
Cash and cash equivalents (note 3) 270.3   270.3   266.7
Short-term Investments 33.9   33.9   71.1
Long-term investments (note 3) 59.3   59.3   58.9
Restricted Cash and Cash Equivalents 14.0   14.0   13.6
Bank balances          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 139.8   139.8   223.7
Unrealized Gains     0.0   0.0
Unrealized Losses     0.0   0.0
Fair Value 139.8   139.8   223.7
Cash and cash equivalents (note 3) 139.8   139.8   223.7
Short-term Investments 0.0   0.0   0.0
Long-term investments (note 3) 0.0   0.0   0.0
Restricted Cash and Cash Equivalents 0.0   0.0   0.0
Investments in privately-held companies          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 51.5 [1]   51.5 [1]   23.3 [2]
Unrealized Gains     2.3   4.9
Unrealized Losses     (1.2)   0.0
Fair Value 52.6   52.6   28.2
Cash and cash equivalents (note 3) 0.0   0.0   0.0
Short-term Investments 0.0   0.0   0.0
Long-term investments (note 3) 52.6   52.6   28.2
Restricted Cash and Cash Equivalents 0.0   0.0   0.0
Bank Balances and Other Investments [Domain]          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 191.3   191.3   247.0
Unrealized Gains     2.3   4.9
Unrealized Losses     (1.2)   0.0
Fair Value 192.4   192.4   251.9
Cash and cash equivalents (note 3) 139.8   139.8   223.7
Short-term Investments 0.0   0.0   0.0
Long-term investments (note 3) 52.6   52.6   28.2
Restricted Cash and Cash Equivalents 0.0   0.0   0.0
Level 1: | Equity securities          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis         10.0
Equity Securities, FV-NI, Unrealized Gain         0.0
Equity Securities, FV-NI, Unrealized Loss         (10.0)
Fair Value         0.0
Cash and cash equivalents (note 3)         0.0
Short-term Investments         0.0
Long-term investments (note 3)         0.0
Restricted Cash and Cash Equivalents         0.0
Level 2:          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 178.4   178.4   127.7
Debt Securities, Available-for-Sale, Unrealized Gain     0.0   0.0
Debt Securities, Available-for-Sale, Unrealized Loss     0.0   0.0
Fair Value 178.4   178.4   127.7
Cash and cash equivalents (note 3) 130.5   130.5   43.0
Short-term Investments 33.9   33.9   71.1
Long-term investments (note 3) 0.0   0.0   0.0
Restricted Cash and Cash Equivalents 14.0   14.0   13.6
Level 2: | Term deposits, and certificates of deposits          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 29.4   29.4   39.3
Debt Securities, Available-for-Sale, Unrealized Gain     0.0   0.0
Debt Securities, Available-for-Sale, Unrealized Loss     0.0   0.0
Fair Value 29.4   29.4   39.3
Cash and cash equivalents (note 3) 20.0   20.0   0.0
Short-term Investments 0.0   0.0   30.1
Long-term investments (note 3) 0.0   0.0   0.0
Restricted Cash and Cash Equivalents 9.4   9.4   9.2
Level 2: | Bearer deposit notes          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 25.0   25.0   10.3
Debt Securities, Available-for-Sale, Unrealized Gain     0.0   0.0
Debt Securities, Available-for-Sale, Unrealized Loss     0.0   0.0
Fair Value 25.0   25.0   10.3
Cash and cash equivalents (note 3) 18.0   18.0   7.3
Short-term Investments 7.0   7.0   3.0
Long-term investments (note 3) 0.0   0.0   0.0
Restricted Cash and Cash Equivalents 0.0   0.0   0.0
Level 2: | Commercial paper          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 84.7   84.7   55.5
Debt Securities, Available-for-Sale, Unrealized Gain     0.0   0.0
Debt Securities, Available-for-Sale, Unrealized Loss     0.0   0.0
Fair Value 84.7   84.7   55.5
Cash and cash equivalents (note 3) 53.2   53.2   27.8
Short-term Investments 26.9   26.9   27.7
Long-term investments (note 3) 0.0   0.0   0.0
Restricted Cash and Cash Equivalents 4.6   4.6   0.0
Level 2: | Non-U.S. promissory notes          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 24.2   24.2   9.8
Debt Securities, Available-for-Sale, Unrealized Gain     0.0   0.0
Debt Securities, Available-for-Sale, Unrealized Loss     0.0   0.0
Fair Value 24.2   24.2   9.8
Cash and cash equivalents (note 3) 24.2   24.2   7.9
Short-term Investments 0.0   0.0   1.9
Long-term investments (note 3) 0.0   0.0   0.0
Restricted Cash and Cash Equivalents 0.0   0.0   0.0
Level 2: | Non-U.S. government sponsored enterprise notes          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis         9.3
Debt Securities, Available-for-Sale, Unrealized Gain         0.0
Debt Securities, Available-for-Sale, Unrealized Loss         0.0
Fair Value         9.3
Cash and cash equivalents (note 3)         0.0
Short-term Investments         4.9
Long-term investments (note 3)         0.0
Restricted Cash and Cash Equivalents         4.4
Level 2: | Non-U.S. treasury bills          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 15.1   15.1    
Debt Securities, Available-for-Sale, Unrealized Gain     0.0    
Debt Securities, Available-for-Sale, Unrealized Loss     0.0    
Fair Value 15.1   15.1    
Cash and cash equivalents (note 3) 15.1   15.1    
Short-term Investments 0.0   0.0    
Long-term investments (note 3) 0.0   0.0    
Restricted Cash and Cash Equivalents 0.0   0.0    
Level 2: | Corporate notes/bonds          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis         3.5
Debt Securities, Available-for-Sale, Unrealized Gain         0.0
Debt Securities, Available-for-Sale, Unrealized Loss         0.0
Fair Value         3.5
Cash and cash equivalents (note 3)         0.0
Short-term Investments         3.5
Long-term investments (note 3)         0.0
Restricted Cash and Cash Equivalents         0.0
Level 3:          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 2.4   2.4    
Unrealized Gains     4.3    
Unrealized Losses     0.0    
Fair Value 6.7   6.7    
Cash and cash equivalents (note 3) 0.0   0.0    
Short-term Investments 0.0   0.0    
Long-term investments (note 3) 6.7   6.7    
Restricted Cash and Cash Equivalents 0.0   0.0    
Level 3: | Investments in privately-held companies          
Cash, Cash Equivalents and Investments [Line Items]          
Cost Basis 2.4   2.4   30.7
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount     4.3   1.2
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount     0.0   (1.2)
Fair Value 6.7   6.7   30.7
Cash and cash equivalents (note 3) 0.0   0.0   0.0
Short-term Investments 0.0   0.0   0.0
Long-term investments (note 3) 6.7   6.7   30.7
Restricted Cash and Cash Equivalents $ 0.0   $ 0.0   $ 0.0
[1] Cost basis for investments in privately-held companies includes the effect of returns of capital and impairment.
[2] Cost basis for investments in privately-held companies includes the effect of returns of capital and impairment.