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Debt and Credit Arrangements (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Summary of outstanding borrowings
The following table represents the components of our borrowings:
 June 30,
2021		December 31,
2020
Senior secured revolving credit facility and term loan:
Term loan due June 2024 (1)
$103.1 $103.1 
Senior secured revolving credit facility due June 2024 (2) (3)
351.8 123.5 
Unamortized debt issuance costs(4.3)(5.0)
Senior secured revolving credit facility and term loan, net of debt issuance costs450.6 221.6 
Convertible notes due November 2024:
Principal amount 258.8 258.8 
Unamortized discount (4)
— (34.8)
Unamortized debt issuance costs(3.3)(3.1)
Convertible notes due November 2024, net of unamortized discount and debt issuance costs255.5 220.9 
Total debt, net of unamortized discount and debt issuance costs706.1 442.5 
Less: current maturities255.5 220.9 
Long-term debt$450.6 $221.6 
_______________
(1)As of June 30, 2021, there were $103.1 in borrowings outstanding under the term loan due June 2024, which is due at maturity, bearing an interest rate of 2.0% (2.5% as of December 31, 2020).
(2)The senior secured revolving credit facility due 2024 includes $100.0 sub limit for letters of credit, a $250.0 sub limit for discretionary letters of credit and $50.0 sub limit for swingline loans. As of June 30, 2021, there were $351.8 in borrowings outstanding under the senior secured revolving credit facility due 2024 bearing a weighted-average interest rate of 1.9% (2.1% as of December 31, 2020) and $45.2 in letters of credit and bank guarantees outstanding supported by the senior secured revolving credit facility due 2024. As of June 30, 2021, the senior secured revolving credit facility due 2024 had availability of $153.0.
(3)A portion of borrowings outstanding under our senior secured revolving credit facility due 2024 are denominated in euros (“EUR Revolver Borrowings”). EUR Revolver Borrowings outstanding were 86.5 million euros (equivalent to $102.8) and 74.5 million euros (equivalent to $91.4) at June 30, 2021 and December 31, 2020, respectively. During the three and six months ended June 30, 2021, we recognized an unrealized foreign currency gain of $8.9 and $5.0, respectively, relative to the translation of the EUR Revolver Borrowings outstanding during the reporting period. This unrealized foreign currency gain is classified as foreign currency loss and other in the condensed consolidated statements of income for the three and six months ended June 30, 2021.
(4)We derecognized the debt discount associated with the convertible notes due November 2024 upon adoption of ASU 2020-06 on January 1, 2021.
Schedule of interest expense and financing cost amortization
The following table summarizes interest expense and financing costs amortization related to the 2024 Credit Facilities:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Interest expense, term loan due June 2024$0.5 $4.0 $1.1 $8.2 
Interest expense, senior secured revolving credit facility due June 20241.3 0.6 2.0 1.2 
Interest expense, senior secured revolving credit facility and term loan due June 2024$1.8 $4.6 $3.1 $9.4 
Financing costs amortization, senior secured revolving credit facility and term loan due June 2024$0.8 $0.9 $1.8 $1.7 
Schedule of interest accretion
The following table summarizes interest accretion of the 2024 Notes discount, 1.0% contractual interest coupon and financing costs amortization associated with the 2024 Notes:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
2024 Notes, interest accretion of convertible notes discount$— $2.0 $— $3.9 
2024 Notes, 1.0% contractual interest coupon
0.7 0.7 1.3 1.3 
2024 Notes, total interest expense$0.7 $2.7 $1.3 $5.2 
2024 Notes, financing costs amortization$0.3 $0.2 $0.5 $0.4