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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Oct. 01, 2023
Assets:    
Total short-term investments $ 212.3 $ 401.5
Derivative assets, Current 51.6 41.0
Derivative assets, Noncurrent 286.2 153.0
Total Assets 4,004.0 4,394.3
Liabilities:    
Derivative liabilities, Current 3.2 3.6
Derivative liabilities, Noncurrent 36.9 43.2
Derivative Liabilities 40.1  
Total liabilities   46.8
Cash and cash equivalents    
Assets:    
Cash and cash equivalents 3,179.1 3,551.5
Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 70.5 70.7
Marketable equity securities 86.6 69.6
Total short-term investments 212.3 401.5
Structured deposits 55.2 261.2
Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 274.6 247.3
Other Long-Term Assets [Member]    
Assets:    
Structured deposits 0.2  
Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 49.9 64.0
Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 113.9 91.1
Foreign Government Short-term Debt Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities:   3.9
Mortgage and other asset-backed securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.3  
Mortgage and other asset-backed securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 54.9 50.2
State and local government obligations | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 1.4  
State and local government obligations | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 3.7 1.3
U.S. government treasury securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 18.7 2.8
U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 102.1 104.7
Corporate Bond Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.2  
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Derivative assets, Current 0.0 0.0
Derivative assets, Noncurrent 0.0 0.0
Total Assets 3,386.5 3,728.6
Liabilities:    
Derivative liabilities, Current 0.0 0.0
Derivative liabilities, Noncurrent 0.0 0.0
Derivative Liabilities 0.0  
Total liabilities   0.0
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 3,179.1 3,551.5
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 18.7 2.8
Marketable equity securities 86.6 69.6
Total short-term investments 105.3 72.4
Structured deposits 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 102.1 104.7
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Assets [Member]    
Assets:    
Structured deposits 0.0  
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities:   0.0
Fair Value, Inputs, Level 1 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0  
Fair Value, Inputs, Level 1 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | State and local government obligations | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0  
Fair Value, Inputs, Level 1 [Member] | State and local government obligations | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | U.S. government treasury securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 18.7 2.8
Fair Value, Inputs, Level 1 [Member] | U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 102.1 104.7
Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0  
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Derivative assets, Current 51.6 41.0
Derivative assets, Noncurrent 286.2 153.0
Total Assets 606.7 665.7
Liabilities:    
Derivative liabilities, Current 3.2 3.6
Derivative liabilities, Noncurrent 36.9 43.2
Derivative Liabilities 40.1  
Total liabilities   46.8
Fair Value, Inputs, Level 2 [Member] | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 0.0 0.0
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 51.8 67.9
Marketable equity securities 0.0 0.0
Total short-term investments 107.0 329.1
Structured deposits 55.2 261.2
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 161.7 142.6
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Assets [Member]    
Assets:    
Structured deposits 0.2  
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 49.9 64.0
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 103.1 91.1
Fair Value, Inputs, Level 2 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities:   3.9
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.3  
Fair Value, Inputs, Level 2 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 54.9 50.2
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 1.4  
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 3.7 1.3
Fair Value, Inputs, Level 2 [Member] | U.S. government treasury securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 2 [Member] | U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.2  
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Derivative assets, Current 0.0 0.0
Derivative assets, Noncurrent 0.0 0.0
Total Assets 10.8 0.0
Liabilities:    
Derivative liabilities, Current 0.0 0.0
Derivative liabilities, Noncurrent 0.0 0.0
Derivative Liabilities 0.0  
Total liabilities   0.0
Fair Value, Inputs, Level 3 [Member] | Cash and cash equivalents    
Assets:    
Cash and cash equivalents 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Marketable equity securities 0.0 0.0
Total short-term investments 0.0 0.0
Structured deposits 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 10.8 0.0
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Assets [Member]    
Assets:    
Structured deposits 0.0  
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 10.8 0.0
Fair Value, Inputs, Level 3 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities:   0.0
Fair Value, Inputs, Level 3 [Member] | Mortgage and other asset-backed securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0  
Fair Value, Inputs, Level 3 [Member] | Mortgage and other asset-backed securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | State and local government obligations | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0  
Fair Value, Inputs, Level 3 [Member] | State and local government obligations | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | U.S. government treasury securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities: 0.0 $ 0.0
Fair Value, Inputs, Level 3 [Member] | Corporate Bond Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities: $ 0.0