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Debt (Tables)
9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Components of Debt
The components of debt consisted of the following:
(in millions)
September 30, 2023December 31, 2022
Revolving Credit Facility expires June 2028$— $— 
Equipment Financing due May 20244.4 9.5 
Equipment Financing due November 202517.1 22.5 
5.15% Mortgage due November 2025
63.8 65.5 
0.375% Convertible Senior Notes due September 2026
800.0 800.0 
Equipment Financing12.7 — 
Term loan due May 2028488.7 492.5 
Equipment Financing due July 202830.4 34.4 
Finance lease obligation(1)
22.1 — 
Unamortized debt discount(6.8)(7.6)
Debt issuance costs(12.0)(15.0)
Total debt, net1,420.4 1,401.8 
Less: current portion49.8 27.5 
Total long-term debt, net$1,370.6 $1,374.3 
(1) Refer to Note 9 for information regarding our finance lease obligation.
Schedule of Carrying Amount and Estimated Fair Value of Convertible Debt
The carrying amount and the estimated fair value of the Company’s debt were as follows:
September 30, 2023December 31, 2022
(in millions)
Carrying
Value
Estimated
Fair Value
Carrying
Value
Estimated
Fair Value (1)
Term loan due May 2028(1)
$479.9 $487.5 $482.1 $485.1 
0.375% Convertible Senior Notes(2)
791.1 562.7 788.8 1,038.7 
Equipment financings(3)
64.2 64.2 66.4 66.4 
5.15% Mortgage(3)
63.1 63.1 64.5 64.5 
  Total$1,398.3 $1,177.5 $1,401.8 $1,654.7 
(1) Term debt is classified as Level 1 in the fair value hierarchy. Fair value was determined using quoted market prices.
(2) The Notes are classified as Level 2 in the fair value hierarchy. Fair value was determined using the Company’s quoted stock price and the contractual conversion rate.
(3) The equipment financings and mortgage are classified as Level 3 in the fair value hierarchy. The fair values of the financial liabilities approximate their carrying values and were determined using their cost bases.
Schedule of Interest Expense
The components of interest expense related to the Notes were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(in millions)
2023202220232022
Contractual interest expense
$0.8 $0.8 $2.3 $2.3 
Amortization of debt issuance costs
0.7 0.7 2.2 2.2 
  Total interest recognized on the Convertible Notes
$1.5 $1.5 $4.5 $4.5