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Debt - Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Aug. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aug. 31, 2017
Long-term debt          
Total long-term debt $ 8,480.5   $ 9,015.3 $ 9,886.9  
Less amounts due within one year 429.8   307.2 1.2  
Long-term debt 8,050.7   8,708.1 9,885.7  
Capitalized debt issuance costs 50.6   49.1 57.9  
3.45% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 1,486.8   1,485.0 1,483.2  
Interest rate 3.45%        
4.50% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 1,230.1   1,229.4 1,228.6  
Interest rate 4.50%        
2.95% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 790.7        
Interest rate 2.95% 2.95%      
2.75% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 757.1   1,242.9 1,240.8  
Interest rate 2.75%        
3.80% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 542.5        
Interest rate 3.80% 3.80%      
3.125% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 497.0   496.3 495.6  
Interest rate 3.125%        
2.25% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 428.6   $ 1,496.0 1,493.1  
Interest rate     2.25%    
4.20% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 411.3   $ 416.8 422.4  
Interest rate 4.20%        
3.45% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 398.0   397.6 397.3  
Interest rate 3.45%        
4.55% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 394.3   394.1 393.9  
Interest rate 4.55%        
3.95% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 359.3   360.8 362.4  
Interest rate 3.95%        
4.00% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 296.4   296.3 296.1  
Interest rate 4.00%        
Floating Rate Loan | Debentures          
Long-term debt          
Total long-term debt $ 251.9   257.4 269.2  
3.30% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 249.4   249.3 249.2  
Interest rate 3.30%        
4.40% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt $ 239.2   238.7 238.3  
Interest rate 4.40%        
7.375% Debentures | Debentures          
Long-term debt          
Total long-term debt $ 119.1   119.0 119.0  
Interest rate 7.375%        
0.92% Fixed Rate Loan | Debentures          
Long-term debt          
Total long-term debt $ 22.4   22.9 23.9  
Interest rate 0.92%       0.92%
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 $ 2.9   3.3 3.7  
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%        
7.25% Senior Notes | Senior Notes          
Long-term debt          
Total long-term debt     $ 306.0 $ 319.4  
Interest rate       7.25%  
Term Loan | Term Loan          
Long-term debt          
Total long-term debt       $ 847.3