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Long-Term Debt and Commercial Paper (Senior Unsecured Notes and Credit Agreement) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 29, 2021
Debt Instrument [Line Items]          
Letters of credit, amount outstanding   $ 39.7      
Senior Notes at Three Point Three Five Percent Due 2021          
Debt Instrument [Line Items]          
Repayment of senior notes   300.0 $ 0.0 $ 0.0  
Revolving Credit Facility Due 2025 [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity under revolving credit facility   1,800.0      
Additional borrowing capacity under accordion feature of revolving credit facility   500.0      
Revolving credit facilities letter of credit sublimit   200.0      
Additional borrowing capacity under revolving credit facility   $ 1,800.0      
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%      
Senior Notes [Member] | Senior Notes at Three Point Three Five Percent Due 2021          
Debt Instrument [Line Items]          
Repayment of senior notes $ 300.0        
Senior notes   $ 0.0 $ 300.0    
Percentage interest on debt instrument   3.35% 3.35%    
Debt instrument, maturity date   Jan. 15, 2021      
Senior Notes [Member] | Senior Notes at Three Point Five Percent Due 2024 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 450.0 $ 450.0    
Percentage interest on debt instrument   3.50%      
Debt instrument, maturity date   Nov. 15, 2024      
Senior Notes [Member] | Senior Notes at Four Point Five Percent Due 2025 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 450.0 450.0    
Percentage interest on debt instrument   4.50%      
Debt instrument, maturity date   Oct. 01, 2025      
Senior Notes [Member] | Senior Notes at Three Point Eight Percent Due 2027 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 300.0 300.0    
Percentage interest on debt instrument   3.80%      
Debt instrument, maturity date   Nov. 15, 2027      
Senior Notes [Member] | Senior Notes at One Point Nine Five Percent Due 2028          
Debt Instrument [Line Items]          
Senior notes   $ 400.0 0.0   $ 400.0
Percentage interest on debt instrument   0.0195%      
Senior notes, aggregate offering price percentage         99.805%
Debt instrument, maturity date   Aug. 01, 2028      
Senior Notes [Member] | Senior Notes at Four Point Seven Five Percent Due 2030          
Debt Instrument [Line Items]          
Senior notes   $ 500.0 500.0    
Percentage interest on debt instrument   4.75%      
Debt instrument, maturity date   Jun. 01, 2030      
Senior Notes [Member] | Senior Notes at Two Point Four Percent Due 2031          
Debt Instrument [Line Items]          
Senior notes   $ 450.0 $ 0.0   $ 450.0
Percentage interest on debt instrument   2.40%      
Senior notes, aggregate offering price percentage         99.735%
Debt instrument, maturity date   Aug. 01, 2031      
Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member]          
Debt Instrument [Line Items]          
Debt instrument, maturity date   Mar. 26, 2025      
Minimum [Member] | Revolving Credit Facility Due 2025 [Member]          
Debt Instrument [Line Items]          
Commitment fee on undrawn amounts (percent)   0.125%      
Maximum [Member] | Revolving Credit Facility Due 2025 [Member]          
Debt Instrument [Line Items]          
Commitment fee on undrawn amounts (percent)   0.20%      
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates (percent)   1.125%      
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates (percent)   1.50%      
Base Rate [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates (percent)   0.125%      
Base Rate [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rates (percent)   0.50%