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Convertible Senior Notes (Tables)
3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Summary of Notes Net of Discount and Deferred Financing Costs

The 2024 Notes, net of discounts and deferred financing costs, consisted of the following:

 

(in millions)

March 31,

2020

 

 

December 31,

2019

 

Principal

$

517.5

 

 

$

517.5

 

Deferred financing costs

 

(6.6

)

 

 

(6.9

)

Debt discount, net

 

(96.8

)

 

 

(101.8

)

Net carrying amount

$

414.1

 

 

$

408.8