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Convertible Senior Notes (Tables)
6 Months Ended
Jun. 30, 2021
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)June 30,
2021
December 31,
2020
Principal$381.2 $381.3 
Deferred financing costs(3.4)(4.0)
Debt discount, net(51.5)(59.4)
Net carrying amount$326.3 $317.9