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Debt (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The carrying amounts of our senior convertible notes were as follows as of the dates indicated:
| December 31,
(Dollars in millions) | 2019 |  | 2018
0.75% Senior Convertible Notes due 2022: |  |  |
Principal amount | $ | 400.0 |  |  | $ | 400.0 |
Unamortized debt discount | (37.2 | ) |  | (51.1 | )
Unamortized debt issuance costs | (4.6 | ) |  | (6.3 | )
Net carrying amount of Senior Convertible Notes due 2022 | 358.2 |  |  | 342.6 |
0.75% Senior Convertible Notes due 2023: |  |  |
Principal amount | 850.0 |  |  | 850.0 |
Unamortized debt discount | (140.0 | ) |  | (171.8 | )
Unamortized debt issuance costs | (8.5 | ) |  | (10.5 | )
Net carrying amount of Senior Convertible Notes due 2023 | 701.5 |  |  | 667.7 |
Total net carrying amount of senior convertible notes | $ | 1,059.7 |  |  | $ | 1,010.3 |
Carrying value of equity component of convertible senior notes, net of debt issuance costs |  |  |
Senior Convertible Notes due 2022 | $ | 70.6 |  |  | $ | 70.6 |
Senior Convertible Notes due 2023 | $ | 171.6 |  |  | $ | 171.6 |
Remaining amortization period of debt discount on the liability component |  |  |
Senior Convertible Notes due 2022 | 2.5 years |  |  | 3.5 years |
Senior Convertible Notes due 2023 | 4.0 years |  |  | 5.0 years |
Schedule of Converted Value of Notes | The amount by which the notes’ if-converted value exceeds their principal amount is as of the dates indicated:
| December 31,
(In millions) | 2019 |  | 2018
Senior Convertible Notes due 2022 | $ | 486.2 |  |  | $ | 125.4 |
Senior Convertible Notes due 2023 | 372.4 |  |  | — |
Total by which the notes’ if-converted value exceeds their principal amount | $ | 858.6 |  |  | $ | 125.4 |
Schedule of Components of Interest Expense and Effective Interest Rates of Senior Convertible Notes | The following table summarizes the components of interest expense and the effective interest rates for each of our senior convertible notes for the periods shown.
(Dollars in millions) | Twelve Months Ended December 31,
| 2019 |  | 2018 |  | 2017
Interest expense recognized: |  |  |  |  |
0.75% Senior Convertible Notes due 2022: |  |  |  |  |
Contractual coupon interest | $ | 3.0 |  |  | $ | 3.0 |  |  | $ | 1.9 |
Accretion of debt discount (1) | 13.9 |  |  | 13.4 |  |  | 8.2 |
Amortization of debt issuance costs | 1.7 |  |  | 1.6 |  |  | 1.0 |
Interest expense recognized on 2022 Notes | 18.6 |  |  | 18.0 |  |  | 11.1 |
0.75% Senior Convertible Notes due 2023: |  |  |  |  |
Contractual coupon interest | 6.3 |  |  | 0.5 |  |  | — |
Accretion of debt discount (2) | 31.9 |  |  | 2.6 |  |  | — |
Amortization of debt issuance costs | 2.0 |  |  | 0.2 |  |  | — |
Interest expense recognized on 2023 Notes | 40.2 |  |  | 3.3 |  |  | — |
Total interest expense recognized on senior notes | $ | 58.8 |  |  | $ | 21.3 |  |  | $ | 11.1 |
Effective interest rates: |  |  |  |  |
0.75% Senior Convertible Notes due 2022 | 5.1 | % |  | 5.1 | % |  | 5.1 | %
0.75% Senior Convertible Notes due 2023 | 5.6 | % |  | 5.6 | % |  | — |
(1) The discount on the 2022 Notes is being amortized through May 15, 2022. Interest on the 2022 Notes began accruing upon issuance and is payable semi-annually on May 15 and November 15 of each year. (2) The discount on the 2023 Notes is being amortized through December 1, 2023. Interest on the 2023 Notes began accruing upon issuance and is payable semi-annually on June 1 and December 1 of each year.
Schedule of Availability and Outstanding Borrowings on Credit Agreement | Information related to availability and outstanding borrowings on our Credit Agreement is as follows:
| December 31,
(In millions) | 2019
Available principal amount | $ | 200.0 |
Letters of credit sub-facility | 10.0 |
Outstanding borrowings | — |
Outstanding letters of credit | 4.4 |
Total available balance | 195.6 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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