Convertible Debt (Tables)

6 Months Ended

Jun. 30, 2023

1.75% Notes [Member]

Convertible Notes [Abstract]

Convertible Senior Notes

At June 30, 2023, 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	$	14.1
Maturity date	June 2028
Interest rate	1.75 percent
Effective interest rate	2.3 percent
Conversion price per share	$	53.73
Total shares of common stock subject to conversion		10.7

0% Notes [Member]

Convertible Notes [Abstract]

Convertible Senior Notes

At June 30, 2023, 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	$	8.7
Maturity date	April 2026
Interest rate	0 percent
Effective interest rate	0.5 percent
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 Notes [Abstract]

Convertible Senior Notes

At June 30, 2023, 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	$	114.8
Unamortized debt issuance costs	$	0.7
Maturity date	December 2024
Interest rate	0.125 percent
Effective interest rate	0.5 percent
Conversion price per share	$	83.28
Effective conversion price per share with call spread	$	123.38
Total shares of common stock subject to conversion		1.4