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Convertible Debt, Net
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Convertible Debt, Net Convertible Debt, Net
The components of outstanding convertible debt consisted of the following:
(in millions)
June 30, 2020December 31, 2019
1.375% Convertible Senior Notes, due November 2024
$402.5  $402.5  
0.375% Convertible Senior Notes, due September 2026
800.0  800.0  
Unamortized debt discount(274.0) (294.8) 
Debt issuance costs(18.3) (19.8) 
Total convertible debt, net$910.2  $887.9  
The carrying amount and the estimated fair value of the Company’s convertible debt, which is based on the Level 2 quoted market prices, were as follows:
June 30, 2020December 31, 2019
(in millions)
Carrying Value
Estimated Fair Value (1)
Carrying Value
Estimated Fair Value (1)
1.375% Convertible Senior Notes, due November 2024
$315.2  $512.8  $306.9  $512.8  
0.375% Convertible Senior Notes, due September 2026
595.0  867.0  581.0  840.0  
  Total$910.2  $1,379.8  $887.9  $1,352.8  
(1) Fair value was determined using market prices obtained from third-party pricing sources.