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Long-Term Debt, Other (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 05, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2016
Long-Term Debt          
Repayment of long-term debt     $ 375.0 $ 217.7  
The “Revolving Credit Facility”          
Long-Term Debt          
Maximum borrowing capacity     2,000.0    
Borrowings under the Revolving Credit Facility     0.0    
Commercial Paper Program          
Long-Term Debt          
Maximum borrowing capacity     $ 2,000.0    
Average interest rate (as a percent)     1.71%   1.06%
Commercial Paper Program | Maximum          
Long-Term Debt          
Maturity term     397 days    
Senior Notes          
Long-Term Debt          
Redemption price as a percentage of principal amount     100.00%    
1.55% Senior Notes due September 2017          
Long-Term Debt          
Stated interest rate (as a percent)         1.55%
Repayment of long-term debt   $ 375.0      
2.20% Senior Notes due April 2020          
Long-Term Debt          
Debt instrument, principal amount $ 400.0        
Stated interest rate (as a percent) 2.20%   2.20%    
Debt instrument, face amount, net of discount (as a percent) 99.922%        
Redemption price as a percentage of principal amount 100.00%        
3.20% Senior Notes due April 2024          
Long-Term Debt          
Debt instrument, principal amount $ 350.0        
Stated interest rate (as a percent) 3.20%   3.20%    
Debt instrument, face amount, net of discount (as a percent) 99.888%        
Redemption price as a percentage of principal amount 100.00%        
2.20% and 3.20% Senior Notes due April, 2020 and 2024, respectively          
Long-Term Debt          
Debt issuance costs incurred     $ 5.2