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Long-Term Debt and Commercial Paper (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Jan. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Jul. 29, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Letters of credit, amount outstanding   $ 39,700,000      
Commercial paper, maximum aggregate amount outstanding permitted   1,000,000,000      
Commercial paper, amount outstanding   $ 0     $ 0
Maximum [Member] | Commercial Paper [Member]          
Debt Instrument [Line Items]          
Maturity period of debt   397 days      
1.95% Senior Notes Due 2028 | Senior Notes [Member]          
Debt Instrument [Line Items]          
Maturity date   Aug. 01, 2028      
Senior notes   $ 400,000,000.0   $ 400,000,000 0
Percentage interest on debt instrument   1.95%      
Debt Instrument Percentage Aggregate Offering Price Percentage       99.805%  
2.4% Senior Notes Due 2031 | Senior Notes [Member]          
Debt Instrument [Line Items]          
Maturity date   Aug. 01, 2031      
Senior notes   $ 450,000,000.0   $ 450,000,000 0
Percentage interest on debt instrument   2.40%      
Debt Instrument Percentage Aggregate Offering Price Percentage       99.735%  
3.35% Senior Notes Due 2021 [Member]          
Debt Instrument [Line Items]          
Payment of 3.35% Senior Notes due 2021   $ 300,000,000.0 $ 0    
3.35% Senior Notes Due 2021 [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Maturity date   Jan. 15, 2021      
Senior notes   $ 0     300,000,000.0
Percentage interest on debt instrument   3.35%      
Payment of 3.35% Senior Notes due 2021 $ 300,000,000        
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      
Revolving credit facility, amount outstanding   0     0
Revolving credit facilities letter of credit sublimit   200,000,000      
Additional borrowing capacity under the revolving credit facility   $ 1,800,000,000      
Leverage ratio, minimum threshold, credit spread (example)   2.0      
Leverage ratio, maximum threshold, credit spread (example)   3.25      
Leverage ratio, minimum threshold, increase in credit spread (example)   3.25      
Impact on credit spread from increase in leverage ratio (example)   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%      
Other Debt [Member]          
Debt Instrument [Line Items]          
Finance leases and other debt obligations included in long-term debt   $ 153,300,000     $ 116,600,000