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Other (Details) - USD ($)
$ in Millions
36 Months Ended
Oct. 01, 2021
Oct. 01, 2018
Jun. 04, 2018
Subsidiaries [Member] | Senior Secured Note [Member] | 4.223% Series Due 2048 [Member] [Domain]      
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 600.0
Debt Instrument, Interest Rate, Stated Percentage     4.223%
Long-term Debt, Term     30 years
Subsidiaries [Member] | Senior Secured Note [Member] | 6.740% Series Due 2018 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 200.0
Subsidiaries [Member] | Commercial Paper [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 348.0
Subsequent Event [Member]      
Debt Instrument [Line Items]      
Loans Payable to Bank   $ 150.0  
Long-term Debt, Term   3 years  
Increase (Decrease) in Other Loans $ 100.0