Quarterly report pursuant to Section 13 or 15(d)

Debt - Narrative (Details)

v3.23.2
Debt - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 15, 2023
USD ($)
Nov. 15, 2022
Aug. 31, 2022
USD ($)
Jan. 31, 2021
USD ($)
May 31, 2018
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
shares
Debt Instrument [Line Items]                  
Payments to unwind warrants                 $ 18.4
2023 convertible senior notes | Convertible Notes                  
Debt Instrument [Line Items]                  
Interest rate (as a percent)         0.75%        
Principal amount         $ 750.0        
Proceeds from debt, net of issuance costs         $ 733.1        
Debt issuance costs           $ 16.9 $ 16.9    
Term of debt instrument             5 years    
Effective interest rate (as a percent)           0.50% 0.50%    
Total interest expense           $ 0.3 $ 0.6    
Contractual interest expense           0.2 0.4    
Amortized issuance costs           $ 0.1 $ 0.2    
Payment of accrued interest $ 0.3                
Maturities of debt $ 76.9                
Securities called by warrants (in shares) | shares         3,018,327       2,559,254
Initial conversion price (in USD per share) | $ / shares         $ 206.65        
Payments for convertible bond hedges         $ 140.3        
Exercise price (dollars per share) | $ / shares         $ 315.38        
Value of warrants issued         $ 90.0        
Repurchased amount of debt instrument       $ 20.3         $ 152.0
Repayments of notes       19.1         156.0
Accrued interest portion of repurchased amount of debt instrument       $ 0.1       $ 0.4 $ 0.3
2023 convertible senior notes | Convertible Notes | Minimum                  
Debt Instrument [Line Items]                  
Initial conversion rate (shares per $1,000)   0.004839              
2023 convertible senior notes | Convertible Notes | Maximum                  
Debt Instrument [Line Items]                  
Initial conversion rate (shares per $1,000)   0.0062907              
2023 convertible senior notes | Convertible Notes | Notes repurchased in August 2022                  
Debt Instrument [Line Items]                  
Repayments of notes     $ 223.7            
Repurchased amount of debt instrument     $ 227.8