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Debt and Credit Facilities (Tables)
 12 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
Components of debt
The components of the Company’s debt as of December 31, were as follows, net of debt discount and debt issuance costs ($ in millions):
20242023
Senior term loan facility due 2028 (the “2028 Term Loan”)
$427.0 $525.8 
Senior euro term loan facility due 2028 (the “2028 Euro Term Loan”)361.6 385.4 
Convertible senior notes due 2028 (the “2028 Convertible Notes”)
489.7 486.9 
Convertible senior notes due 2025 (the “2025 Convertible Notes”)
116.0 115.3 
Total debt1,394.3 1,513.4 
Less: current portion(116.0)(115.3)
Long-term debt$1,278.3 $1,398.1 
Schedule of Maturities of Long-Term Debt
The Company’s contractual minimum principal payments are as follows ($ in millions):

2025$116.3 
2026— 
2027— 
20281,292.6 
Total$1,408.9 
Components of convertible debt
The following table sets forth total interest expense recognized related to convertible notes ($ in millions):
Year Ended December 31,
20242023
Contractual interest expense:
   2028 Convertible Notes$8.8 $3.4 
   2025 Convertible Notes2.8 9.1 
Amortization of debt issuance costs:
   2028 Convertible Notes2.8 1.0 
   2025 Convertible Notes0.7 2.0 
Total interest expense
$15.1 $15.5 
Components of unamortized debt discount and issuance costs
The remaining unamortized debt issuance costs for debt outstanding were as follows ($ in millions):
Year Ended December 31,
20242023
2028 Convertible Notes$10.5 $13.3 
2025 Convertible Notes0.3 1.0 
2028 Term Loan3.0 4.2 
2028 Euro Term Loan0.8 1.0 
$14.6 $19.5