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Financial Instruments - Long-term Debt Instruments (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 27, 2021
Dec. 27, 2020
Jun. 28, 2020
Debt Instrument [Line Items]      
Carrying Cost $ 4,610.0 $ 5,127.9 $ 5,219.4
Less: Deferred debt expenses 31.7 35.3 38.3
Current portion of long-term debt 189.6 432.6 378.6
Long-term debt, carrying cost 4,388.7 4,660.0 4,802.5
Fair Value 5,079.6 5,617.8 5,460.7
Long-term debt, fair value $ 5,079.6 5,617.8 5,460.7
3.90% Notes Due 2029      
Debt Instrument [Line Items]      
Debt stated interest rate 3.90%    
Carrying Cost $ 900.0 900.0 900.0
Fair Value $ 982.1 1,011.2 938.1
3.55% Notes Due 2026      
Debt Instrument [Line Items]      
Debt stated interest rate 3.55%    
Carrying Cost $ 675.0 675.0 675.0
Fair Value $ 731.9 752.7 712.2
3.00% Notes Due 2024      
Debt Instrument [Line Items]      
Debt stated interest rate 3.00%    
Carrying Cost $ 500.0 500.0 500.0
Fair Value $ 530.2 540.6 523.4
6.35% Notes Due 2040      
Debt Instrument [Line Items]      
Debt stated interest rate 6.35%    
Carrying Cost $ 500.0 500.0 500.0
Fair Value $ 675.2 636.5 579.7
3.50% Notes Due 2027      
Debt Instrument [Line Items]      
Debt stated interest rate 3.50%    
Carrying Cost $ 500.0 500.0 500.0
Fair Value $ 538.1 544.5 516.0
2.60% Notes Due 2022      
Debt Instrument [Line Items]      
Debt stated interest rate 2.60%    
Carrying Cost $ 300.0 300.0 300.0
Fair Value $ 308.0 311.5 309.7
5.10% Notes Due 2044      
Debt Instrument [Line Items]      
Debt stated interest rate 5.10%    
Carrying Cost $ 300.0 300.0 300.0
Fair Value 353.0 $ 338.1 304.0
3.15% Notes Due 2021      
Debt Instrument [Line Items]      
Debt stated interest rate   3.15%  
Carrying Cost 0.0 $ 300.0 300.0
Fair Value 0.0 302.3 318.6
Aggregate principal amount $ 300.0 300.0  
6.60% Debentures Due 2028      
Debt Instrument [Line Items]      
Debt stated interest rate 6.60%    
Carrying Cost $ 109.9 109.9 109.9
Fair Value 136.0 137.4 124.5
Variable % Notes Due December 30, 2022      
Debt Instrument [Line Items]      
Carrying Cost 50.0 300.0 400.0
Fair Value 50.0 300.0 400.0
Repayments of debt 250.0    
Variable % Notes Due December 30, 2024      
Debt Instrument [Line Items]      
Carrying Cost 562.5 577.5 592.5
Fair Value 562.5 577.5 592.5
Production Financing Facilities      
Debt Instrument [Line Items]      
Carrying Cost 212.6 165.5 142.0
Fair Value $ 212.6 $ 165.5 $ 142.0