Convertible Debt (Tables)

3 Months Ended

Mar. 31, 2021

Following the closing of the debt transaction in April 2021, we had the following 0% Notes outstanding (amounts in millions except interest rate and price per share data):

	0% Notes
Outstanding principal balance	$	632.5
Maturity date	April 2026
Interest rate	0 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% Convertible Senior Notes [Member]

Convertible Notes [Abstract]

Convertible Notes

At March 31, 2021, we had the following 0.125% Notes outstanding with interest payable semi-annually (amounts in millions except interest rate and price per share data):

	0.125% Notes
Outstanding principal balance	$	548.8
Maturity date	December 2024
Interest rate	0.125 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		6.6
Unamortized debt issuance costs	$	8.1

1% Convertible Senior Notes [Member]

Convertible Notes [Abstract]

Convertible Notes

At March 31, 2021, we had the following 1% Notes outstanding with interest payable semi-annually (amounts in millions except interest rate and price per share data):

	1% Notes
Outstanding principal balance	$	309.9
Maturity date	November 2021
Interest rate	1 percent
Conversion price per share	$	66.81
Total shares of common stock subject to conversion		4.6
Unamortized debt issuance costs	$	0.8