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Debt and Credit Arrangements (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Instrument |
Summary of Outstanding Borrowings | The following table represents the components of our borrowings:
| September 30, 2018 |  | December 31, 2017
Convertible notes due November 2024: |  |  |
Principal amount | $ | 258.8 |  |  | $ | 258.8 |
Unamortized discount | (52.2 | ) |  | (57.6 | )
Unamortized debt issuance costs | (4.6 | ) |  | (5.1 | )
Convertible notes due November 2024, net of unamortized discount and debt issuance costs | 202.0 |  |  | 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 | 298.5 |  |  | 239.0 |
Foreign facilities | 9.7 |  |  | 7.9 |
Total debt, net of unamortized discount and debt issuance costs | 510.2 |  |  | 498.1 |
Less: current maturities (1) | (9.7 | ) |  | (58.9 | )
Long-term debt | $ | 500.5 |  |  | $ | 439.2 |
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(1) | Current maturities at December 31, 2017 includes $55.1 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 September 30, 2018 |  | Nine Months Ended September 30, 2018
2024 Notes, interest accretion of convertible notes discount | $ | 1.9 |  |  | $ | 5.4 |
2024 Notes, 1.0% contractual interest coupon | 0.6 |  |  | 1.9 |
2024 Notes, total interest expense | $ | 2.5 |  |  | $ | 7.3 |
2024 Notes, financing costs amortization | $ | 0.2 |  |  | $ | 0.5 |
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 September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
2018 Notes, interest accretion of convertible notes discount | $ | 0.4 |  |  | $ | 3.4 |  |  | $ | 1.9 |  |  | $ | 10.0 |
2018 Notes, 2.0% contractual interest coupon | 0.1 |  |  | 1.3 |  |  | 1.0 |  |  | 3.8 |
2018 Notes, total interest expense | $ | 0.5 |  |  | $ | 4.7 |  |  | $ | 2.9 |  |  | $ | 13.8 |
2018 Notes, financing costs amortization | $ | — |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 0.6 |

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