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Debt and Credit Arrangements Tables (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Instrument  
Summary of Outstanding Borrowings and Costs
The following table represents the components of our borrowings:
 
December 31,
 
2018
 
2017
Convertible notes due November 2024:
 
 
 
Principal amount
$
258.8

 
$
258.8

Unamortized discount
(50.4
)
 
(57.6
)
Unamortized debt issuance costs
(4.5
)
 
(5.1
)
Convertible notes due November 2024, net of unamortized discount and debt issuance costs
203.9

 
196.1

 
 
 
 
Convertible notes due August 2018:
 
 
 
Principal amount
—

 
57.1

Unamortized discount
—

 
(1.9
)
Unamortized debt issuance costs
—

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

 
55.1

 
 
 
 
Senior secured revolving credit facility due November 2022
329.3

 
239.0

Foreign facilities
11.2

 
7.9

Total debt, net of unamortized discount and debt issuance costs
544.4

 
498.1

Less: current maturities (1)
(11.2
)
 
(58.9
)
Long-term debt
$
533.2

 
$
439.2

_______________
(1) 
Current maturities at December 31, 2017 includes $55.1 of Convertible notes due August 2018, net of unamortized discount and debt issuance costs.
The following table summarizes interest expense and financing costs amortization associated with the SSRCF:
 
Year Ended December 31,
 
2018
 
2017
 
2016
SSRCF, interest expense
$
11.8

 
$
2.7

 
$
—

SSRCF, financing costs amortization
$
0.6

 
$
0.6

 
$
0.6
Scheduled Annual Maturities
The scheduled annual maturities of debt at December 31, 2018, are as follows: 
Year
Amount
2019 (1) (2)
$
11.2

2022
329.3

2024
258.8

Total
$
599.3

_______________
(1) 
Includes $11.2 current maturities related to foreign facilities.
(2) 
As noted above, the CCESC term loan matures on May 26, 2024, however, the remaining outstanding balance of 6.6 million Chinese yuan (equivalent to $1.0) is below the minimum required semi-annual installment payment amount of 10.0 million Chinese yuan and therefore is scheduled to be paid in 2019.
Convertible Notes, due 2024  
Debt Instrument  
Schedule of Interest Accretion, Loss on Extinguishment, and Amortization of Financing Costs [Table Text Block]
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:
 
Year Ended December 31,
 
2018
 
2017
2024 Notes, interest accretion of convertible notes discount
$
7.2

 
$
1.1

2024 Notes, 1.0% contractual interest coupon
2.6

 
0.4

2024 Notes, total interest expense
$
9.8

 
$
1.5

 
 
 
 
2024 Notes, financing costs amortization
$
0.6

 
$
0.1
Convertible Notes, due 2018  
Debt Instrument  
Schedule of Interest Accretion, Loss on Extinguishment, and Amortization of Financing Costs [Table Text Block]
The following table summarizes interest accretion of the 2018 Notes discount, 2.0% contractual interest coupon, loss on extinguishment of debt and financing costs amortization associated with the 2018 Notes:
 
Year Ended December 31,
 
2018
 
2017
 
2016
2018 Notes, interest accretion of convertible notes discount
$
1.9

 
$
11.8

 
$
12.5

2018 Notes, 2.0% contractual interest coupon
1.0

 
4.3

 
5.0

2018 Notes, total interest expense
$
2.9

 
$
16.1

 
$
17.5

 
 
 
 
 
 
2018 Notes, loss on extinguishment of debt, bond cost portion
—

 
4.3

 
—

2018 Notes, write off of unamortized debt issuance costs
—

 
0.4

 
—

2018 Notes, total loss on extinguishment of debt (1)
$
—

 
$
4.7

 
$
—

 
 
 
 
 
 
2018 Notes, financing costs amortization
$
0.1

 
$
0.6

 
$
0.7