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Convertible Debt, Net (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Outstanding Convertible Debt and Related Deferred Financing Costs
The components of outstanding convertible debt consisted of the following: 
 
As of December 31,
(in millions)
2019
 
2018
1.25% Convertible Senior Notes, due September 2021
$

 
$
345.0

1.375% Convertible Senior Notes, due November 2024
402.5

 
402.5

0.375% Convertible Senior Notes, due September 2026
800.0

 

Unamortized debt discount
(294.8
)
 
(143.6
)
Debt issuance costs
(19.8
)
 
(11.9
)
Total convertible debt, net
$
887.9

 
$
592.0


Summary of Carrying Amount and Estimated Fair Value of Convertible Debt
The carrying amount and the estimated fair value of the Company’s convertible debt, which is based on the Level 2 quoted market prices as of December 31, 2019 and 2018 are as follows:
 
As of December 31,
 
2019
2,019

2018
(in millions)
Carrying
Value
 
Estimated
Fair Value (1)
 
Carrying
Value
 
Estimated
Fair Value (1)
1.25% Convertible Senior Notes

 

 
301.0

 
483.9

1.375% Convertible Senior Notes
306.9

 
512.8

 
291.0

 
426.0

0.375% Convertible Senior Notes
581.0

 
840.0

 

 

Total
$
887.9

 
$
1,352.8

 
$
592.0

 
$
909.9

(1) Fair value was determined using market prices obtained from third-party pricing sources.