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Convertible Senior Notes (Tables)
9 Months Ended
Sep. 30, 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)September 30,
2020
December 31,
2019
Principal$517.5 $517.5 
Deferred financing costs(5.9)(6.9)
Debt discount, net(86.6)(101.8)
Net carrying amount$425.0 $408.8