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Debt and Credit Arrangements (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Instrument  
Summary of Outstanding Borrowings
The following table represents the components of our borrowings:
 
June 30,
2019
 
December 31,
2018
Convertible notes due November 2024:
 
 
 
Principal amount
$
258.8

 
$
258.8

Unamortized discount
(46.6
)
 
(50.4
)
Unamortized debt issuance costs
(4.2
)
 
(4.5
)
Convertible notes due November 2024, net of unamortized discount and debt issuance costs
208.0

 
203.9

 
 
 
 
Senior secured revolving credit facility (1)
96.7

 
329.3

Term loan (2)
—

 
—

Foreign facilities
4.5

 
11.2

Total debt, net of unamortized discount and debt issuance costs
309.2

 
544.4

Less: current maturities
(4.5
)
 
(11.2
)
Long-term debt
$
304.7

 
$
533.2


_______________
(1) 
See below for information on the senior secured credit facility which closed in June 2019 and replaced the previous facility.
(2) 
The term loan was drawn subsequent to June 30, 2019 in conjunction with the AXC acquisition. See below for more information.
Convertible Notes, due 2024  
Debt Instrument  
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
 
2019
 
2018
 
2019
 
2018
2024 Notes, interest accretion of convertible notes discount
$
1.9

 
$
1.8

 
$
3.7

 
$
3.5

2024 Notes, 1.0% contractual interest coupon
0.7

 
0.7

 
1.3

 
1.3

2024 Notes, total interest expense
$
2.6

 
$
2.5

 
$
5.0

 
$
4.8

 
 
 
 
 
 
 
 
2024 Notes, financing costs amortization
$
0.1

 
$
0.1

 
$
0.3

 
$
0.3
Convertible Notes, Due 2018  
Debt Instrument  
Schedule of Interest Accretion
The following table summarizes interest accretion of the 2018 Notes discount, 2.00% contractual interest coupon, and financing costs amortization associated with the 2018 Notes:
 
Three Months Ended June 30, 2018
 
Six Months Ended June 30, 2018
2018 Notes, interest accretion of convertible notes discount
$
0.7

 
$
1.5

2018 Notes, 2.0% contractual interest coupon
0.3

 
0.9

2018 Notes, total interest expense
$
1.0

 
$
2.4