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Borrowings (narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
May 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Weighted average interest rate (in percentage)   2.36%    
Line of credit facility, remaining borrowing capacity   $ 5,420.0    
Line of credit facility, outstanding   $ 25.9 $ 6.0  
Proceeds from issuance of secured debt $ 2,230.0      
Description of derivative activity volume percent   25.00%    
Debt instrument, interest rate, effective percentage (in percentage)   3.13% 2.65%  
Cash payments for interest on borrowings   $ 223.8 $ 192.7 $ 146.4
Notes Due in May 2022        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 750.0      
Stated interest rate (in percentage) 2.35%      
Notes Due in May 2027        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 750.0      
Stated interest rate (in percentage) 3.10%      
Notes Due in 2047        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 750.0      
Stated interest rate (in percentage) 3.95%      
Minimum        
Debt Instrument [Line Items]        
Stated interest rate (in percentage)   0.15%    
Maximum        
Debt Instrument [Line Items]        
Stated interest rate (in percentage)   7.13%    
Maturity Date, 2023        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 3,000.0    
Maturity Date, 2019        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 2,000.0    
Debt instrument, term   364 days