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Financial Instruments (Schedule of Short-term and Long-term Classification) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, including current portion $ (16,741.2) $ (16,348.7)
Carrying Amount    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, including current portion (16,884.7) (16,595.3)
Fair Value    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, including current portion (18,157.7) (19,038.9)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, including current portion 0.0 0.0
Significant Other Observable Inputs (Level 2) | Fair Value    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, including current portion (18,157.7) (19,038.9)
Significant Unobservable Inputs (Level 3) | Fair Value    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, including current portion $ 0.0 $ 0.0