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Debt and Credit Facilities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Feb. 29, 2016
Proceeds from long-term debt $ 0.0 $ 1,497.9    
Commercial Paper Program Maximum Aggregate Amount Available To Be Issued 2,000.0      
Long-term debt excluding current maturities 4,624.8   $ 4,922.9  
Short-term borrowings and current maturities of long-term debt 949.7   650.3  
Debt Instrument, Fair Value Disclosure 5,900.0   6,200.0  
Five Year Revolving Credit Facility Refinanced [Member]        
Line of credit facility, amount outstanding 2,000.0      
Five Year Revolving Credit Facility [Member]        
Line of credit facility, amount outstanding 1,000.0      
Commercial Paper [Member]        
Short-term borrowings and current maturities of long-term debt     0.0  
Debentures With Put Feature [Member]        
Short-term borrowings and current maturities of long-term debt $ 343.0   343.0  
Debt Instrument, Maturity Date Range, Start Jan. 01, 2027      
Debt instrument, maturity date range, end Jan. 01, 2028      
Debentures with put option available to be exercised       $ 37.2
Three Point Five Percent Senior notes Due Two Thousand Twenty Six [Member]        
Long-term debt excluding current maturities $ 396.9 400.0 $ 396.8  
Debt Instrument, Interest Rate, Stated Percentage 3.50%   3.50%  
Three Point Eight Percent Senior Notes Due Two Thousand Twenty Nine [Member]        
Long-term debt excluding current maturities $ 743.7 750.0 $ 743.6  
Debt Instrument, Interest Rate, Stated Percentage 3.80%   3.80%  
Four Point Five Percent Senior Notes Due Two Thousand Forty Nine [Member]        
Long-term debt excluding current maturities $ 345.5 $ 350.0 $ 345.5  
Debt Instrument, Interest Rate, Stated Percentage 4.50%   4.50%  
4.25% Senior notes due 2023 [Member]        
Long-term debt excluding current maturities $ 697.9   $ 697.8  
Debt Instrument, Interest Rate, Stated Percentage 4.25%   4.25%  
5.75% Senior notes due 2043 [Member]        
Long-term debt excluding current maturities $ 494.6   $ 494.5  
Debt Instrument, Interest Rate, Stated Percentage 5.75%   5.75%  
Three Point Five Five Percent Senior Notes due 2024 [Member]        
Long-term debt excluding current maturities $ 496.8   $ 496.6  
Debt Instrument, Interest Rate, Stated Percentage 3.55%   3.55%  
Four Point Six Five Percent Senior Notes due Twenty Forty Four [Member]        
Long-term debt excluding current maturities $ 296.0   $ 295.9  
Debt Instrument, Interest Rate, Stated Percentage 4.65%   4.65%