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Borrowings - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 04, 2022
Mar. 09, 2021
Dec. 27, 2019
Nov. 25, 2019
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2020
Dec. 18, 2018
Jun. 18, 2018
Aug. 22, 2017
Mar. 15, 2017
Oct. 31, 2016
Nov. 22, 2013
Jun. 21, 2010
Mar. 30, 2010
Nov. 17, 2006
Long-term and Short-term Debt Instruments                                  
Weighted-average effective interest rate (as a percent)           3.30%                      
Total borrowings at par value           $ 3,025.0   $ 3,080.0                  
Repayment of long-term debt           1,150.0 $ 824.9                    
Total premium paid to redeem           14.3                      
Commercial Paper                                  
Long-term and Short-term Debt Instruments                                  
Threshold over which Commercial Paper Program limit will be reduced for borrowings on Revolving Credit Facility           $ 1,500.0                      
Maximum days to maturity           397 days                      
Weighted-average effective interest rate (as a percent)           0.20%                      
Weighted-average term           5 days                      
Total borrowings at par value           $ 275.0   80.0                  
Revolving Credit Facility                                  
Long-term and Short-term Debt Instruments                                  
Maximum borrowing capacity                 $ 1,500.0                
EBITDA interest coverage ratio           300                      
Interest rate margin on revolving credit facility (as a percent)           1.10%                      
Facility fee (as a percent)           0.15%                      
Revolver balance outstanding at the end of period           $ 0.0   0.0                  
Letter of Credit Sub-Facility                                  
Long-term and Short-term Debt Instruments                                  
Maximum borrowing capacity                 250.0                
Term Loan Facility Borrowing (Effective Rate of 1.4%)                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value           $ 300.0 [1]   $ 950.0 [1] $ 950.0                
Outstanding borrowings under term loan facility                         $ 575.0        
Repayment of long-term debt         $ 650.0                        
Effective interest rate (as a percent)           1.40%   1.40%                  
Term Loan Facility Borrowing (Effective Rate of 1.4%) | Subsequent Event                                  
Long-term and Short-term Debt Instruments                                  
Repayment of long-term debt $ 300.0                                
1.350% Notes Due 2026                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value   $ 600.0     $ 600.0 $ 600.0 [1]                      
Stated interest rate (as a percent)         1.35% 1.35%                      
Redemption price (as a percent)   101.00%                              
Repurchase provisions, percentage of principal           101.00%                      
Effective interest rate (as a percent)           1.50%                      
1.350% Notes Due 2026 | Base Rate [Member]                                  
Long-term and Short-term Debt Instruments                                  
Basis spread on applicable treasury rate (as a percent)   0.15%                              
2.750% Notes Due 2031                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value   $ 300.0       $ 300.0 [1]                      
Stated interest rate (as a percent)   2.75%       2.75%                      
Repurchase provisions, percentage of principal           101.00%                      
Effective interest rate (as a percent)           2.90%                      
2.750% Notes Due 2031 | Base Rate [Member]                                  
Long-term and Short-term Debt Instruments                                  
Basis spread on applicable treasury rate (as a percent)   0.25%                              
2.850% Notes Due 2025                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value       $ 500.0   $ 500.0 [2]   $ 500.0 [2]                  
Stated interest rate (as a percent)       2.85%   2.85%   2.85%                  
Premium on early redemptions (as a percent)           0.20%                      
Repurchase provisions, percentage of principal           101.00%                      
2.850% Notes Due 2025 | Maximum                                  
Long-term and Short-term Debt Instruments                                  
Effective interest rate (as a percent)       4.85%                          
2.850% Notes Due 2025 | Minimum                                  
Long-term and Short-term Debt Instruments                                  
Effective interest rate (as a percent)       2.85%                          
4.250% Notes Due 2023                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value           $ 300.0 [2]   $ 300.0 [2]   $ 300.0              
Stated interest rate (as a percent)           4.25%   4.25%   4.25%              
Premium on early redemptions (as a percent)                   0.25%              
Repurchase provisions, percentage of principal           101.00%                      
4.250% Notes Due 2023 | Maximum                                  
Long-term and Short-term Debt Instruments                                  
Effective interest rate (as a percent)                   6.25%              
4.250% Notes Due 2023 | Minimum                                  
Long-term and Short-term Debt Instruments                                  
Effective interest rate (as a percent)                   4.25%              
Floating Rate Notes Due 2019                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value                     $ 250.0            
3.600% Notes Due 2022                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value           $ 500.0   $ 500.0 [1]     $ 100.0 $ 400.0          
Stated interest rate (as a percent)           3.60%   3.60%                  
Total premium paid to redeem           $ 14.3                      
3.350% Notes Due 2019                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value                           $ 250.0      
6.200% Notes Due 2040                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value           $ 250.0 [2]   $ 250.0 [2]             $ 250.0    
Stated interest rate (as a percent)           6.20%   6.20%             6.20%    
Premium on early redemptions (as a percent)           0.30%                      
Repurchase provisions, percentage of principal           101.00%                      
Notes Due 2020                                  
Long-term and Short-term Debt Instruments                                  
Stated interest rate (as a percent)                               5.253%  
Repayment of unsecured notes     $ 268.8 $ 56.1                          
Debt instrument, original face amount                               $ 303.7  
Unamortized premium of debt instrument                               $ 21.2  
Premium given to note holders (as a percent)                               7.00%  
Total premium paid to redeem     $ 3.1                            
6.200% Notes Due 2036                                  
Long-term and Short-term Debt Instruments                                  
Total borrowings at par value           $ 500.0 [2]   $ 500.0 [2]                 $ 500.0
Stated interest rate (as a percent)           6.20%   6.20%                 6.20%
[1] See the Term Loan Facility and Notes sections below for further discussion of the borrowings and repayments of the unsecured notes and term loan made in 2021.
[2] The difference between the stated interest rate and the effective interest rate is not significant.