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Debt and Credit Facilities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Long-term Debt $ 1,500.0 $ 1,150.0 $ 1,497.9 $ 1,147.0 $ 0.0
Long-term Debt, Excluding Current Maturities     $ 4,922.9 $ 3,740.7  
Amortization of Debt Discount (Premium)   15.4      
Interest Expense, Debt   1.2      
Debt Issuance Costs, Gross 13.1        
Weighted average interest rate on short term borrowings and current maturities of long term debt     4.60% 6.30%  
Commercial paper program maximum aggregate amount available to be issued     $ 2,000.0    
Short-term borrowings and current maturities of long-term debt     650.5 $ 350.6  
Repayments of Long-term Debt     7.5 1,123.0 $ 7.7
Line of credit facility, maximum borrowing capacity     (2,000.0)    
Debt Instrument, Fair Value Disclosure     6,200.0 4,200.0  
Three Point Five Percent Senior notes Due Two Thousand Twenty Six [Member]          
Long-term Debt, Excluding Current Maturities 400.0   $ 396.8 0.0  
Debt instrument, interest rate     3.50%    
6.625% Percent Senior Notes Due Two Thousand Twenty [Member]          
Long-term Debt, Excluding Current Maturities     $ 0.0 $ 299.4  
Debt instrument, interest rate       2.625%  
3.55% Senior Notes due 2024 [Member]          
Long-term Debt, Excluding Current Maturities     $ 496.6 $ 495.9  
Debt instrument, interest rate     3.55% 3.55%  
4.650% Percent Senior Notes due Twenty Forty Four [Member]          
Long-term Debt, Excluding Current Maturities     $ 295.9 $ 295.8  
Debt instrument, interest rate     4.65% 4.65%  
Two Point Nine Percent Senior Notes Due Two Thousand Twenty One [Member] [Member]          
Long-term Debt, Excluding Current Maturities   300.0 $ 299.1 $ 298.3  
Debt instrument, interest rate     2.90% 2.90%  
Three Point Seven Five Percent Senior Notes Due Two Thousand Twenty Eight [Member]          
Long-term Debt, Excluding Current Maturities   550.0 $ 545.1 $ 544.5  
Debt instrument, interest rate     3.75% 3.75%  
9.00% Debentures Due 2021 [Member]          
Long-term Debt, Excluding Current Maturities     $ 124.9 $ 124.9  
Debt instrument, interest rate     9.00% 9.00%  
4.250% Senior Notes Due 2013 [Member]          
Long-term Debt, Excluding Current Maturities     $ 697.8 $ 697.1  
Debt instrument, interest rate     4.25% 4.25%  
7.20% Debentures Due 2014-2025 [Member]          
Long-term Debt, Excluding Current Maturities     $ 37.3 $ 44.8  
Debt instrument, interest rate     7.20% 7.20%  
6.48% Debentures Due 2025 [Member]          
Long-term Debt, Excluding Current Maturities     $ 149.7 $ 149.7  
Debt instrument, interest rate     6.48% 6.48%  
Three Point Eight Percent Senior Notes Due Two Thousand Twenty Nine [Member]          
Long-term Debt, Excluding Current Maturities 750.0   $ 743.6 $ 0.0  
Debt instrument, interest rate     3.80%    
5.750% Senior Notes Due 2043 [Member]          
Long-term Debt, Excluding Current Maturities     $ 494.5 $ 494.3  
Debt instrument, interest rate     5.75% 5.75%  
Other Loans And Notes [Member]          
Long-term Debt, Excluding Current Maturities     $ 0.1 $ 0.1  
Debt instrument, interest rate     0.00% 0.00%  
Four Point Three Percent Senior Notes Due Two Thousand Forty Eight [Member]          
Long-term Debt, Excluding Current Maturities   $ 300.0 $ 296.0 $ 295.9  
Debt instrument, interest rate     4.30% 4.30%  
Four Point Five Percent Senior Notes Due Two Thousand Forty Nine [Member]          
Long-term Debt, Excluding Current Maturities $ 350.0   $ 345.5 $ 0.0  
Debt instrument, interest rate     4.50%    
Debentures With Put Feature [Member]          
Short-term borrowings and current maturities of long-term debt       $ 343.0  
Debt instrument, maturity date range, start     Jan. 01, 2027    
Debt instrument, maturity date range, end     Dec. 31, 2028    
Five Year Revolving Credit Facility [Member]          
Line of credit facility, maximum borrowing capacity     $ (1,000.0)