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Debt and Financing - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2020
Apr. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Repayment of debt     $ 376,200,000 $ 950,000,000.0 $ 0
Loss on extinguishment of debt $ 55,000,000.0   55,000,000.0 15,300,000 0
Sale of receivables     57,500,000 64,000,000.0 122,800,000
Proceeds from sale and collection of receivables     57,400,000 69,700,000 $ 123,200,000
Receivables from sale of receivables 3,900,000   $ 3,900,000 $ 5,300,000  
Minimum          
Debt Instrument [Line Items]          
Number of days due from receivable     1 day    
Maximum          
Debt Instrument [Line Items]          
Number of days due from receivable     90 days    
Senior Notes | 1.200% fixed-rate notes ("2025-II Notes")          
Debt Instrument [Line Items]          
Principal amount $ 400,000,000.0   $ 400,000,000.0    
Stated interest rate 1.20%   1.20%    
Senior Notes | 2.000% fixed-rate notes ("2030 Notes")          
Debt Instrument [Line Items]          
Principal amount $ 400,000,000.0   $ 400,000,000.0    
Stated interest rate 2.00%   2.00%    
Senior Notes | 4.500% fixed-rate notes (2024 Notes) - Issued March 2014          
Debt Instrument [Line Items]          
Stated interest rate 4.50%   4.50%    
Repayment of debt     $ 500,000,000.0    
Debt redemption, amount $ 234,200,000   $ 234,200,000    
Senior Notes | 4.350% fixed-rate notes ("2025-I Notes")          
Debt Instrument [Line Items]          
Stated interest rate 4.35%   4.35%    
Repayment of debt     $ 300,000,000.0    
Debt redemption, amount $ 142,000,000.0   $ 142,000,000.0    
Senior Notes | 3.750% fixed-rate notes ("2029 Notes")          
Debt Instrument [Line Items]          
Stated interest rate 3.75%   3.75%    
Senior Notes | Fixed Rate Note Due 2025 And Fixed Rate Note Due 2029          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percent     100.00%    
Repurchase price percentage related to change in control 101.00%   101.00%    
Line of Credit          
Debt Instrument [Line Items]          
Amounts outstanding $ 0   $ 0    
Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt, term   5 years      
Maximum borrowing capacity   $ 500,000,000.0      
Additional borrowing capacity   $ 200,000,000.0      
Maturity extension option period   1 year      
Maximum leverage ratio   3.0      
Maximum leverage ratio, if acquisition is consummated   3.5      
Interest coverage ratio   3.0      
Line of Credit | Revolving Credit Facility | Minimum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.00%      
Line of Credit | Revolving Credit Facility | Minimum | Eurodollar          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.91%      
Line of Credit | Revolving Credit Facility | Maximum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.375%      
Line of Credit | Revolving Credit Facility | Maximum | Eurodollar          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.375%      
Variable Rate Component, Federal Funds | Line of Credit | Revolving Credit Facility | Federal Funds Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.50%      
Variable Rate Component, ICE Benchmark Administration Settlement Rate | Line of Credit | Revolving Credit Facility | ICE Benchmark Administration Settlement Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.00%