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Debt and Credit Arrangements (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Instrument  
Schedule of Debt
The following table represents the components of our borrowings:
 
June 30,
2018
 
December 31,
2017
Convertible notes due November 2024:
 
 
 
Principal amount
$
258.8

 
$
258.8

Unamortized discount
(54.1
)
 
(57.6
)
Unamortized debt issuance costs
(4.8
)
 
(5.1
)
Convertible notes due November 2024, net of unamortized discount and debt issuance costs
199.9

 
196.1

 
 
 
 
Convertible notes due August 2018:
 
 
 
Principal amount
57.1

 
57.1

Unamortized discount
(0.4
)
 
(1.9
)
Unamortized debt issuance costs
—

 
(0.1
)
Convertible notes due August 2018, net of unamortized discount and debt issuance costs
56.7

 
55.1

 
 
 
 
Senior secured revolving credit facility due November 2022
244.0

 
239.0

Foreign facilities
10.1

 
7.9

Total debt, net of unamortized discount and debt issuance costs
510.7

 
498.1

Less: current maturities (1)
(66.8
)
 
(58.9
)
Long-term debt
$
443.9

 
$
439.2


_______________
(1) 
Current maturities at June 30, 2018 includes $56.7 of Convertible notes due August 2018, net of unamortized discount and debt issuance costs.
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, 2018
 
Six Months Ended June 30, 2018
2024 Notes, interest accretion of convertible notes discount
$
1.8

 
$
3.5

2024 Notes, 1.0% contractual interest coupon
0.7

 
1.3

2024 Notes, total interest expense
$
2.5

 
$
4.8

 
 
 
 
2024 Notes, financing costs amortization
$
0.1

 
$
0.3
Convertible Notes, Due 2018  
Debt Instrument  
Schedule of Interest Accretion
The following table summarizes interest accretion of the 2018 Notes discount, 2.0% contractual interest coupon, and financing costs amortization associated with the 2018 Notes:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
2018 Notes, interest accretion of convertible notes discount
$
0.7

 
$
3.3

 
$
1.5

 
$
6.6

2018 Notes, 2.0% contractual interest coupon
0.3

 
1.2

 
0.9

 
2.5

2018 Notes, total interest expense
$
1.0

 
$
4.5

 
$
2.4

 
$
9.1

 
 
 
 
 
 
 
 
2018 Notes, financing costs amortization
$
0.1

 
$
0.2

 
$
0.1

 
$
0.4