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Indebtedness (Details) - USD ($)
1 Months Ended 3 Months Ended
Feb. 28, 2021
Mar. 31, 2021
Mar. 31, 2020
Apr. 30, 2020
Sep. 15, 2015
Debt Instrument [Line Items]          
Payments of financing costs   $ 24,400,000      
Repayments of Senior Debt $ 151,800,000        
Repayments of borrowings and premiums paid on debt exchange   169,300,000 $ 0    
Interest Expense   $ 64,700,000 $ 44,300,000    
2.250% Senior Notes due May 1, 2030          
Debt Instrument [Line Items]          
Senior notes interest rate   2.25%      
3.150% Senior Notes due May 1, 2050          
Debt Instrument [Line Items]          
Senior notes interest rate   3.15%      
5.200% Senior Notes due 2045          
Debt Instrument [Line Items]          
Senior notes interest rate   5.20%      
Repayments of Senior Debt 12,100,000        
Debt Instrument, Redemption, Amount 8,900,000        
Long Term Debt, Exchanged, Amount 624,600,000        
Gain (Loss) on Extinguishment of Debt   $ 3,200,000      
Repayments of borrowings and premiums paid on debt exchange   13,800,000      
Interest Expense   $ 6,100,000      
3.250% Senior Notes, Due February 15, 2051          
Debt Instrument [Line Items]          
Senior notes interest rate   3.25%      
Long Term Debt, Exchanged, Amount $ 700,700,000        
Senior Notes          
Debt Instrument [Line Items]          
Face amount       $ 3,000,000,000.0  
Senior Notes | 2.250% Senior Notes due May 1, 2030          
Debt Instrument [Line Items]          
Face amount       $ 1,500,000,000  
Senior notes interest rate       2.25%  
Percentage par value of senior notes       99.973%  
Senior Notes | 3.150% Senior Notes due May 1, 2050          
Debt Instrument [Line Items]          
Face amount       $ 1,500,000,000  
Senior notes interest rate       3.15%  
Percentage par value of senior notes       99.174%  
Senior Notes | 2.90% Senior Notes Due Sept 15, 2020          
Debt Instrument [Line Items]          
Face amount         $ 1,500,000,000
Senior notes interest rate         2.90%
Percentage par value of senior notes         99.792%
Payment of early call premium and write off of remaining unamortized debt issuance costs   $ 12,700,000      
Interest Expense | Senior Notes | 2.90% Senior Notes Due Sept 15, 2020          
Debt Instrument [Line Items]          
Pre-tax charge, payment of early call premium and write off of remaining unamortized debt issuance costs, net of derivative gain   9,400,000      
Interest Expense | Interest rate swap          
Debt Instrument [Line Items]          
Derivative, gain on derivative   $ 3,300,000