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Debt Activities During the Period (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Mar. 31, 2020
Dec. 31, 2019
USD ($)
Jan. 17, 2017
USD ($)
Dec. 31, 2016
Debt Instrument [Line Items]                
CCFF commercial paper | £       £ 600,000,000        
Goodwill, Gross     $ 3,200,000,000          
Maximum capitalization ratio allowed by debt agreements   60.00% 60.00% 60.00%        
Term loan                
Debt Instrument [Line Items]                
Repayments of Bank Debt $ 190,000,000.0              
Debt Instrument, Interest Rate, Stated Percentage               281.30%
Unsecured debt | Notes due 2025 4.50%                
Debt Instrument [Line Items]                
Long-term Debt, Gross   € 200,000,000 $ 245,400,000     $ 0    
Debt Instrument, Interest Rate, Stated Percentage   4.50% 4.50% 4.50%        
Debt Instrument, Interest Rate, Increase (Decrease) 5.75%              
Unsecured debt | 5.00% Notes due 2020                
Debt Instrument [Line Items]                
Repayments of Unsecured Debt $ 233,900,000              
Long-term Debt, Gross     $ 0     $ 224,600,000    
Debt Instrument, Interest Rate, Stated Percentage   5.00% 5.00% 5.00% 5.00% 5.00%    
Line of Credit | Revolving credit facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   € 500,000,000         $ 2,500,000,000