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Long-Term Debt (Interest Rates And Due Dates) (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2021
May 31, 2020
Jan. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Finance leases       $ 3,700,000 $ 3,600,000
Total debt       2,090,300,000 1,900,200,000
Unamortized discounts and deferred loan costs       (17,700,000) (12,700,000)
Less: current maturities       300,600,000 50,900,000
Total long-term debt       $ 1,789,700,000 1,849,300,000
Long-term debt, term       180 days  
Maximum borrowing capacity       $ 1,200,000,000 $ 1,200,000,000
Revolving credit facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity       $ 1,200,000,000  
Term notes          
Debt Instrument [Line Items]          
Redemption price, percent       100.00%  
Long-term debt, term       90 days  
Redemption price, if change of control repurchase event occurs, percent       101.00%  
Limitation on secured debt, percent       15.00%  
Industrial development bonds, principally variable interest rates          
Debt Instrument [Line Items]          
Year-end Interest Rate       0.30% 0.30%
Short term and long term debt       $ 3,800,000 $ 3,800,000
Commercial paper          
Debt Instrument [Line Items]          
Year-end Interest Rate       0.00% 0.00%
Short term and long term debt       $ 0 $ 0
Other, partially secured          
Debt Instrument [Line Items]          
Short term and long term debt       $ 500,000 $ 500,000
Net commercial paper          
Debt Instrument [Line Items]          
Weighted average interest rate       0.20% 2.00%
Line of Credit          
Debt Instrument [Line Items]          
Maturities (term)   5 years      
Maximum borrowing capacity   $ 1,200,000,000      
Line of Credit | Revolving credit facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity       $ 1,200,000,000  
Senior Notes, Due 2022 | Term notes          
Debt Instrument [Line Items]          
Year-end Interest Rate       3.40% 3.40%
Short term and long term debt       $ 300,000,000.0 $ 300,000,000.0
Senior Notes, Due 2024 | Term notes          
Debt Instrument [Line Items]          
Year-end Interest Rate       3.80% 3.80%
Short term and long term debt       $ 300,000,000.0 $ 300,000,000.0
Senior Notes, Due 2027 | Term notes          
Debt Instrument [Line Items]          
Year-end Interest Rate       3.50% 3.50%
Short term and long term debt       $ 500,000,000.0 $ 500,000,000.0
Senior Notes, Due 2029 | Term notes          
Debt Instrument [Line Items]          
Year-end Interest Rate       4.40% 4.40%
Short term and long term debt       $ 500,000,000.0 $ 500,000,000.0
Seniors Note, Due 2051 | Term notes          
Debt Instrument [Line Items]          
Year-end Interest Rate       3.50%
Short term and long term debt       $ 500,000,000.0
Term Loan, Due 2024 | Term Loan          
Debt Instrument [Line Items]          
Year-end Interest Rate         3.00%
Short term and long term debt         $ 305,000,000.0
Debt instrument amount issued     $ 500,000,000.0    
Maturities (term)     5 years    
Quarterly principal payment     $ 12,500,000    
Repayments of debt $ 280,000,000.0