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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Oct. 01, 2023
Assets:    
Total short-term investments $ 383.0 $ 401.5
Derivative assets, Current 37.2 41.0
Derivative assets, Noncurrent 119.2 153.0
Total Assets 3,779.7 4,394.3
Liabilities:    
Derivative liabilities, Current 10.5 3.6
Derivative liabilities, Noncurrent 38.4 43.2
Derivative Liabilities 48.9  
Total liabilities   46.8
Cash and cash equivalents    
Assets:    
Cash and cash equivalents 3,000.4 3,551.5
Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 79.8 70.7
Marketable equity securities 77.7 69.6
Total short-term investments 383.0 401.5
Structured deposits 225.5 261.2
Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 239.8 247.3
Other Long-Term Assets [Member]    
Assets:    
Structured deposits 0.1  
Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 65.1 64.0
Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 89.2 91.1
Foreign Government Short-term Debt Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 4.0 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 50.0 50.2
State and local government obligations | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 1.4 1.3
U.S. government treasury securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 10.4 2.8
U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 99.2 104.7
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Derivative assets, Current 0.0 0.0
Derivative assets, Noncurrent 0.0 0.0
Total Assets 3,187.7 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 3,000.4 3,551.5
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 10.4 2.8
Marketable equity securities 77.7 69.6
Total short-term investments 88.1 72.4
Structured deposits 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 99.2 104.7
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 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 | 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 10.4 2.8
Fair Value, Inputs, Level 1 [Member] | U.S. government treasury securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 99.2 104.7
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Derivative assets, Current 37.2 41.0
Derivative assets, Noncurrent 119.2 153.0
Total Assets 581.7 665.7
Liabilities:    
Derivative liabilities, Current 10.5 3.6
Derivative liabilities, Noncurrent 38.4 43.2
Derivative Liabilities 48.9  
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 69.4 67.9
Marketable equity securities 0.0 0.0
Total short-term investments 294.9 329.1
Structured deposits 225.5 261.2
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 130.3 142.6
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Assets [Member]    
Assets:    
Structured deposits 0.1  
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 65.1 64.0
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 78.9 91.1
Fair Value, Inputs, Level 2 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member]    
Assets:    
Available-for-sale debt securities 4.0 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 50.0 50.2
Fair Value, Inputs, Level 2 [Member] | State and local government obligations | Long-term Investments [Member]    
Assets:    
Available-for-sale debt securities 1.4 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 3 [Member]    
Assets:    
Derivative assets, Current 0.0 0.0
Derivative assets, Noncurrent 0.0 0.0
Total Assets 10.3 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 10.3 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 10.3 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 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 | 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