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Debt - Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 31, 2019
Long-term debt        
Total long-term debt $ 8,851.5 $ 8,292.0 $ 8,480.5  
Less amounts due within one year 260.6 25.1 429.8  
Long-term debt 8,590.9 8,266.9 8,050.7  
Capitalized debt issuance costs 57.6 52.9 50.6  
3.45% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 1,490.4 1,488.6 1,486.8  
Interest rate 3.45%      
4.50% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 1,231.6 1,230.8 1,230.1  
Interest rate 4.50%      
2.95% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 792.6 791.7 790.7  
Interest rate 2.95%     2.95%
3.80% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 543.0 542.8 542.5  
Interest rate 3.80%     3.80%
3.125% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 498.3 497.7 497.0  
Interest rate 3.125%      
2.30% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 496.2 495.8 0.0  
Interest rate 2.30%      
3.30% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 493.9 493.7 0.0  
Interest rate 3.30%      
2.20% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 493.6 0.0 0.0  
Interest rate 2.20%      
2.90% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 491.3 0.0 0.0  
Interest rate 2.90%      
3.45% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 398.7 398.3 398.0  
Interest rate 3.45%      
4.55% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 394.7 394.5 394.3  
Interest rate 4.55%      
3.95% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 356.2 357.8 359.3  
Interest rate 3.95%      
4.00% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 296.7 296.6 296.4  
Interest rate 4.00%      
2.75% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 260.0 259.6 757.1  
Interest rate 2.75%      
3.30% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 249.6 249.5 249.4  
Interest rate 3.30%      
4.40% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 240.0 239.6 239.2  
Interest rate 4.40%      
7.375% Debentures | Debentures        
Long-term debt        
Total long-term debt $ 119.2 119.1 119.1  
Interest rate 7.375%      
7.45% Debentures | Debentures        
Long-term debt        
Total long-term debt $ 3.5 3.5 3.5  
Interest rate 7.45%      
0.53% to 8.00% Promissory Notes | Debentures        
Long-term debt        
Total long-term debt $ 2.0 2.3 2.9  
0.53% to 8.00% Promissory Notes | Debentures | Minimum        
Long-term debt        
Interest rate 0.53%      
0.53% to 8.00% Promissory Notes | Debentures | Maximum        
Long-term debt        
Interest rate 8.00%      
4.20% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 0.0 405.7 411.3  
Interest rate 4.20%      
0.92% Fixed Rate Loan | Debentures        
Long-term debt        
Total long-term debt $ 0.0 24.4 22.4  
Interest rate 0.92%      
Floating Rate Loan | Debentures        
Long-term debt        
Total long-term debt $ 0.0 0.0 251.9  
2.25% Senior Notes | Senior Notes        
Long-term debt        
Total long-term debt $ 0.0 $ 0.0 $ 428.6  
Interest rate   2.25%