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Debt - Additional Information (Details)
3 Months Ended 9 Months Ended
Apr. 21, 2021
USD ($)
Mar. 09, 2021
USD ($)
trading_day
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Line Of Credit Facility              
Proceeds from line of credit       $ 0 $ 0    
Cash and cash equivalents $ 609,000,000   $ 234,128,000 234,128,000   $ 603,623,000  
Revolving credit facility     0 0   0  
Letter of credit outstanding     2,000,000 2,000,000      
Convertible senior notes     $ 592,335,000 592,335,000   $ 0  
NIC              
Line Of Credit Facility              
Payments to acquire business 2,300,000,000            
Convertible Senior Notes Due 2026 | Senior Notes              
Line Of Credit Facility              
Net proceeds from issuance   $ 591,400,000   $ 594,000,000      
Initial purchasers discount   6,000,000          
Debt issuance costs   2,600,000          
Effective percentage interest rate     1.19% 1.19%      
Debt instrument face amount   $ 600,000,000 $ 600,000,000 $ 600,000,000      
Debt instrument, interest rate, stated percentage   0.25%          
Common stock exceeds conversion price percentage   130.00%          
Debt instrument, convertible, threshold trading days | trading_day   20          
Convertible senior notes     592,335,000 592,335,000      
Observation period (days) | trading_day   30          
Redemption percentage   100.00%          
Initial conversion rate (shares)   0.20266%          
Initial conversion price (in dollars per share) | $ / shares   $ 493.44          
Consecutive trading days | trading_day   30          
Convertible Senior Notes Due 2026 | Senior Notes | Fair Value, Inputs, Level 2              
Line Of Credit Facility              
Debt instrument, fair value     659,400,000 659,400,000      
Revolving Credit Facility | Bridge Loan              
Line Of Credit Facility              
Unsecured bridge loan facility commitment fee 6,400,000   $ 0 $ 6,407,000      
Debt retired 1,600,000,000            
Debt instrument face amount             $ 1,600,000,000
Revolving Credit Facility | 2021 Credit Agreement              
Line Of Credit Facility              
Revolving credit facility, maximum borrowing capacity 1,400,000,000            
Net proceeds from issuance 1,100,000,000            
Initial purchasers discount 7,200,000            
Debt issuance costs 4,900,000            
Effective percentage interest rate     3.25% 3.25%      
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility              
Line Of Credit Facility              
Revolving credit facility, maximum borrowing capacity $ 500,000,000            
Commitment fee (percent) 0.25%            
Proceeds from line of credit $ 250,000,000            
Revolving credit facility     $ 0 $ 0      
Line of credit facility, unused borrowing capacity     $ 500,000,000 $ 500,000,000      
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Minimum              
Line Of Credit Facility              
Commitment fee (percent) 0.15%            
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Minimum | Base Rate              
Line Of Credit Facility              
Line of credit facility interest rate 0.125%            
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Minimum | Libor Rate              
Line Of Credit Facility              
Line of credit facility interest rate 1.125%            
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Maximum              
Line Of Credit Facility              
Commitment fee (percent) 0.30%            
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Maximum | Base Rate              
Line Of Credit Facility              
Line of credit facility interest rate 0.75%            
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility | Maximum | Libor Rate              
Line Of Credit Facility              
Line of credit facility interest rate 1.75%            
Revolving Credit Facility | Term Loan              
Line Of Credit Facility              
Proceeds from line of credit $ 900,000,000            
Revolving Credit Facility | Term Loan A-1              
Line Of Credit Facility              
Revolving credit facility, maximum borrowing capacity $ 600,000,000            
Debt instrument, term 5 years            
Quarterly prepayment fee (percent) 5.00%            
Revolving Credit Facility | Term Loan A-1 | Minimum | Base Rate              
Line Of Credit Facility              
Line of credit facility interest rate 0.125%            
Revolving Credit Facility | Term Loan A-1 | Minimum | Libor Rate              
Line Of Credit Facility              
Line of credit facility interest rate 1.125%            
Revolving Credit Facility | Term Loan A-1 | Maximum | Base Rate              
Line Of Credit Facility              
Line of credit facility interest rate 0.75%            
Revolving Credit Facility | Term Loan A-1 | Maximum | Libor Rate              
Line Of Credit Facility              
Line of credit facility interest rate 1.75%            
Revolving Credit Facility | Term Loan A-2              
Line Of Credit Facility              
Revolving credit facility, maximum borrowing capacity $ 300,000,000            
Debt instrument, term 3 years            
Revolving Credit Facility | Term Loan A-2 | Minimum | Base Rate              
Line Of Credit Facility              
Line of credit facility interest rate 0.00%            
Revolving Credit Facility | Term Loan A-2 | Minimum | Libor Rate              
Line Of Credit Facility              
Line of credit facility interest rate 0.875%            
Revolving Credit Facility | Term Loan A-2 | Maximum | Base Rate              
Line Of Credit Facility              
Line of credit facility interest rate 0.50%            
Revolving Credit Facility | Term Loan A-2 | Maximum | Libor Rate              
Line Of Credit Facility              
Line of credit facility interest rate 1.50%            
Revolving Credit Facility | 2019 Credit Agreement              
Line Of Credit Facility              
Debt instrument face amount             $ 400,000,000