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Debt - Additional Information (Details)
3 Months Ended 6 Months Ended
Apr. 21, 2021
USD ($)
Mar. 09, 2021
USD ($)
trading_day
$ / shares
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Line Of Credit Facility                
Proceeds from line of credit         $ 65,000,000 $ 0    
Revolving credit facility     $ 65,000,000   65,000,000   $ 0  
Letter of credit outstanding     2,000,000.0   2,000,000.0      
Interest expense     12,438,000 $ 251,000 12,915,000 $ 502,000    
Cash and cash equivalents $ 609,000,000   $ 216,773,000   216,773,000   $ 603,623,000  
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   6,000,000.0            
Debt issuance costs   $ 2,600,000            
Effective percentage interest rate     0.54%   0.54%      
Debt instrument, interest rate, stated percentage   0.25%            
Debt instrument face amount   $ 600,000,000 $ 600,000,000   $ 600,000,000      
Common stock exceeds conversion price percentage   130.00%            
Debt instrument, convertible, threshold trading days | trading_day   20            
Observation period (days) | trading_day   30            
Redemption percentage   100.00%            
Initial conversion rate (shares)   0.20266%            
Initial conversion price | $ / shares   $ 493.44            
Consecutive trading days | trading_day   30            
Interest expense     375,000   458,000      
Revolving Credit Facility | Bridge Loan                
Line Of Credit Facility                
Unsecured bridge loan facility commitment fee 6,400,000   $ 6,407,000   $ 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     1.79%   1.79%      
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     $ 65,000,000.0   $ 65,000,000.0      
Line of credit facility, unused borrowing capacity     435,000,000   435,000,000      
Interest expense     534,000   534,000      
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              
Interest expense     2,660,000   2,660,000      
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
Interest expense     $ 163,000   $ 313,000