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Long-Term Debt and Commercial Paper (Narrative) (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
May 21, 2020
Debt Instrument [Line Items]        
Payment of 5.5% Senior Notes due 2020 $ 350,000,000.0 $ 0    
Letters of credit, amount outstanding 39,700,000      
Commercial paper, maximum aggregate amount outstanding permitted 1,000,000,000.0      
Commercial paper, amount outstanding $ 0   $ 170,000,000.0  
Commercial Paper [Member]        
Debt Instrument [Line Items]        
Weighted-average annual interest rate     2.13%  
Maximum [Member] | Commercial Paper [Member]        
Debt Instrument [Line Items]        
Maturity period of debt 397 days      
Weighted Average [Member] | Commercial Paper [Member]        
Debt Instrument [Line Items]        
Maturity period of debt     12 days  
4.75% Senior Notes Due 2030 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes $ 500,000,000.0   $ 0 $ 500,000,000.0
Debt Instrument Percentage Aggregate Offering Price Percentage       99.479%
Maturity date Jun. 01, 2030      
Percentage interest on debt instrument 4.75%      
3.35% Senior Notes due 2021 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes $ 300,000,000.0   300,000,000.0  
Maturity date Jan. 15, 2021      
Percentage interest on debt instrument 3.35%      
3.5% Senior Notes Due 2024 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes $ 450,000,000.0   450,000,000.0  
Maturity date Nov. 15, 2024      
Percentage interest on debt instrument 3.50%      
4.5% Senior Notes due 2025 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes $ 450,000,000.0   450,000,000.0  
Maturity date Oct. 01, 2025      
Percentage interest on debt instrument 4.50%      
3.8% Senior Notes Due 2027 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes $ 300,000,000.0   300,000,000.0  
Maturity date Nov. 15, 2027      
Percentage interest on debt instrument 4.00%      
Revolving Credit Facility Due 2025 [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity under revolving credit facility $ 1,800,000,000      
Additional borrowing capacity under accordion feature of revolving credit facility 500,000,000.0      
Revolving credit facility, amount outstanding 0   0  
Revolving credit facilities letter of credit sublimit 200,000,000.0      
Additional borrowing capacity under the revolving credit facility 1,800,000,000      
Borrowing capacity limited under the maximum consolidated leverage ratio $ 1,300,000,000      
Leverage ratio, minimum threshold, current credit spread 2.0      
Leverage ratio, maximum threshold, current credit spread 3.25      
Leverage ratio, minimum threshold, increase in credit spread 3.25      
Impact on credit spread from increase in leverage ratio 0.125%      
Revolving Credit Facility Due 2025 [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Commitment fee on undrawn amounts (percent) 0.125%      
Revolving Credit Facility Due 2025 [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Commitment fee on undrawn amounts (percent) 0.20%      
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Maturity date Mar. 26, 2025      
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates (percent) 1.125%      
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates (percent) 1.50%      
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] | Base Rate [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates (percent) 0.125%      
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] | Base Rate [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates (percent) 0.50%      
5.5% Senior Notes Due 2020 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes $ 0   350,000,000.0  
Payment of 5.5% Senior Notes due 2020 $ 350,000,000.0      
Maturity date Feb. 01, 2020      
Percentage interest on debt instrument 5.50%      
Other Debt [Member]        
Debt Instrument [Line Items]        
Finance leases included in long-term debt $ 106,600,000   $ 93,900,000