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Convertible Debt (Tables)
3 Months Ended
Mar. 31, 2024
1.75% Notes [Member]  
Convertible Debt [Abstract]  
Convertible Senior Notes

At March 31, 2024, we had the following 1.75% Notes outstanding (in millions except interest rate and price per share data):

 
1.75% Notes
 
Outstanding principal balance
 
$
575.0
 
Unamortized debt issuance costs
 
$
12.0
 
Maturity date
 
June 2028
 
Interest rate
   
1.75
%
Effective interest rate
   
2.3
%
Conversion price per share
 
$
53.73
 
Total shares of common stock subject to conversion
   
10.7
 
0% Notes [Member]  
Convertible Debt [Abstract]  
Convertible Senior Notes

At March 31, 2024, we had the following 0% Notes outstanding (in millions except interest rate and price per share data):

 
0% Notes
 
Outstanding principal balance
 
$
632.5
 
Unamortized debt issuance costs
 
$
6.3
 
Maturity date
 
April 2026
 
Interest rate
   
0
%
Effective interest rate
   
0.5
%
Conversion price per share
 
$
57.84
 
Effective conversion price per share with call spread
 
$
76.39
 
Total shares of common stock subject to conversion
   
10.9
 
0.125% Notes [Member]  
Convertible Debt [Abstract]  
Convertible Senior Notes

At March 31, 2024, we had the following 0.125% Notes outstanding with interest payable semi-annually (in millions except interest rate and price per share data):

 
0.125% Notes
 
Outstanding principal balance
 
$
44.5
 
Unamortized debt issuance costs
 
$
0.1
 
Maturity date
 
December 2024
 
Interest rate
   
0.125
%
Effective interest rate
   
0.5
%
Conversion price per share
 
$
83.28
 
Effective conversion price per share with call spread
 
$
123.38
 
Total shares of common stock subject to conversion, excluding shares related to 0.125% Notes that we have repurchased and are currently holding in treasury
   
0.5