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Debt, U.S. Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 01, 2020
Feb. 20, 2020
Sep. 11, 2019
Sep. 10, 2019
Jan. 09, 2019
Jan. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Sep. 04, 2019
Debt                        
Repayments of long-term debt                 $ 402,900,000 $ 1,111,200,000    
Premiums paid on early extinguishment of debt                 0 13,400,000    
Gain (loss) on extinguishment of debt             $ 0 $ (14,300,000) $ 0 (14,300,000)    
Gain (loss) on extinguishment of debt, after tax               $ (12,500,000)   $ (12,500,000)    
Gain (loss) on extinguishment of debt, per diluted share               $ (0.04)   $ (0.04)    
U.S. Senior Notes                        
Debt                        
Redemption price as a percentage of principal amount                 100.00%      
Debt instrument, covenant compliance                 At September 30, 2020, the Company was in compliance with the financial covenants under its U.S. Senior Notes.      
2.20% Senior Notes due April 2020                        
Debt                        
Stated interest rate (as a percent) 2.20%                   2.20%  
Repayments of long-term debt $ 400,000,000.0                      
2.55% Senior Notes due January 2019                        
Debt                        
Stated interest rate (as a percent)           2.55%            
Repayments of long-term debt           $ 750,000,000.0            
4.350% Senior Notes due June 2029                        
Debt                        
Redemption price as a percentage of principal amount         100.00%              
Debt instrument, principal amount         $ 500,000,000.0              
Stated interest rate (as a percent)         4.35%   4.35%   4.35%   4.35%  
Debt instrument, face amount, net of discount (as a percent)         99.904%              
Debt maturity date                 Jun. 01, 2029      
2.800% Senior Notes due February 2030                        
Debt                        
Redemption price as a percentage of principal amount       100.00%                
Debt instrument, principal amount       $ 900,000,000.0                
Stated interest rate (as a percent)       2.80%     2.80%   2.80%   2.80%  
Debt instrument, face amount, net of discount (as a percent)       99.92%                
Debt maturity date                 Feb. 15, 2030      
3.125% Senior Notes Due September 2021 and 4.00% Senior Notes due February 2022 [Member] | Tender Offers [Member]                        
Debt                        
Total consideration for debt tender offers     $ 368,800,000                  
Premiums paid on early extinguishment of debt     13,400,000                  
Accrued interest     $ 3,100,000                  
3.125% Senior Notes due September 2021                        
Debt                        
Stated interest rate (as a percent)             3.125%   3.125%   3.125%  
3.125% Senior Notes due September 2021 | Tender Offers [Member]                        
Debt                        
Redemption price as a percentage of principal amount     101.90%                  
Debt instrument, principal amount                       $ 375,000,000.0
Stated interest rate (as a percent)                       3.125%
Senior Note principal redeemed     $ 147,300,000                  
4.00% Senior Notes due February 2022                        
Debt                        
Stated interest rate (as a percent)             4.00%   4.00%   4.00%  
4.00% Senior Notes due February 2022 | Tender Offers [Member]                        
Debt                        
Redemption price as a percentage of principal amount     104.50%                  
Debt instrument, principal amount                       $ 500,000,000.0
Stated interest rate (as a percent)                       4.00%
Senior Note principal redeemed     $ 205,000,000.0                  
3.20% Senior Notes due April 2024                        
Debt                        
Stated interest rate (as a percent)             3.20%   3.20%   3.20%  
2.05% Senior Notes due March 2025                        
Debt                        
Redemption price as a percentage of principal amount   100.00%                    
Debt instrument, principal amount   $ 400,000,000.0                    
Stated interest rate (as a percent)   2.05%         2.05%   2.05%      
Debt instrument, face amount, net of discount (as a percent)   99.829%                    
Debt maturity date                 Mar. 01, 2025