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Debt - Additional Information (Details)
1 Months Ended 12 Months Ended
Sep. 29, 2019
USD ($)
May 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jan. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
2.25% Medium-term notes due 2019 | Medium-term Notes                
Debt Instrument [Line Items]                
Long-term debt, gross           $ 0 $ 600,000,000  
Extinguishment of debt, amount       $ 600,000,000.0        
Extinguishment of debt, stated interest rate       2.25%        
Floating-Rate Medium Term Notes due 2019 | Medium-term Notes                
Debt Instrument [Line Items]                
Long-term debt, gross           0 150,000,000  
Extinguishment of debt, amount     $ 150,000,000.0          
Two Point Four Percent Medium-Term Notes Due 2019 | Medium-term Notes                
Debt Instrument [Line Items]                
Long-term debt, gross           $ 0 $ 600,000,000  
Extinguishment of debt, amount $ 600,000,000.0              
Extinguishment of debt, stated interest rate 2.40%              
6.80% Medium-term notes due 2018 | Medium-term Notes                
Debt Instrument [Line Items]                
Extinguishment of debt, amount         $ 877,500,000      
Extinguishment of debt, stated interest rate         6.80%      
Revolving Credit Facility | Variable Rate Notes Maturing May 11 2020                
Debt Instrument [Line Items]                
Debt instrument, term   364 days            
Line of credit, maximum borrowing capacity   $ 195,000,000.0            
Line of Credit | Credit Facility Maturing April 2023, Five Year Maturity                
Debt Instrument [Line Items]                
Debt instrument, term           5 years    
Line of credit, maximum borrowing capacity               $ 780,000,000.0
Line of Credit | Credit Facility Maturing April 2021, Five Year Term                
Debt Instrument [Line Items]                
Debt instrument, term           5 years    
Line of credit, maximum borrowing capacity               $ 765,000,000.0
Line of Credit | Global Credit Facilities                
Debt Instrument [Line Items]                
Covenant, debt to equity ratio           10.0    
Covenant, debt to equity ratio, excluding subsidiary debt           0.7    
Unsecured Commercial Paper                
Debt Instrument [Line Items]                
Debt instrument, term           365 days    
Weighted-average interest rate of commercial paper           1.94% 2.79%