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Debt | 9 Months Ended
--- | ---
Sep. 30, 2018
Debt Disclosure [Abstract] |
Debt |
12. | Debt
At September 30, 2018 and December 31, 2017, our long-term debt and interest rates on that debt were as follows (dollars in millions):
|  | September 30, 2018 |  |  | December 31, 2017 |
|  | Amount |  |  | Interest Rate |  |  | Amount |  |  | Interest Rate |
6.50% Senior Notes due March 2018 |  | $ | — |  |  |  | — | % |  | $ | 150.0 |  |  |  | 6.50 | %
2.45% Senior Notes, net of discount of $0.4 million and $0.5 million as of September 30, 2018 and December 31, 2017, respectively, due December 2020 |  |  | 499.6 |  |  |  | 2.45 | % |  |  | 499.5 |  |  |  | 2.45 | %
3.90% Senior Notes, net of discount of $0.1 million and $0.2 million as of September 30, 2018 and December 31, 2017, respectively, due June 2022 |  |  | 399.9 |  |  |  | 3.90 | % |  |  | 399.8 |  |  |  | 3.90 | %
4.50% Senior Notes, net of discount of $1.1 million and $1.2 million as of September 30, 2018 and December 31, 2017, respectively, due November 2023 |  |  | 698.9 |  |  |  | 4.50 | % |  |  | 698.8 |  |  |  | 4.50 | %
3.65% Senior Notes, net of discount of $0.7 million and $0.8 million as of September 30, 2018 and December 31, 2017, respectively, due September 2024 |  |  | 399.3 |  |  |  | 3.65 | % |  |  | 399.2 |  |  |  | 3.65 | %
3.40% Senior Notes, net of discount of $1.5 million and $1.6 million as of September 30, 2018 and December 31, 2017, respectively, due December 2027 |  |  | 498.5 |  |  |  | 3.40 | % |  |  | 498.4 |  |  |  | 3.40 | %
Total |  |  | 2,496.2 |  |  |  | 3.64 | % |  |  | 2,645.7 |  |  |  | 3.80 | %
Less current portion |  |  | — |  |  |  | — | % |  |  | 150.0 |  |  |  | 6.50 | %
Less unamortized debt issuance costs |  |  | 13.3 |  |  |  |  |  |  |  | 15.3 |  |  |  |  |
Total long-term debt |  | $ | 2,482.9 |  |  |  | 3.64 | % |  | $ | 2,480.4 |  |  |  | 3.64 | %
During the nine months ended September 30, 2018, we used cash on hand to repay debt outstanding of $150.0 million under the 6.50% Senior Notes due March 2018. For the nine months ended September 30, 2018 and 2017, cash payments for interest were $58.6 million and $67.2 million, respectively. Included in interest expense, net and other, are amortization of treasury lock settlements and amortization of financing costs. For the three months ended September 30, 2018 and 2017, amortization of treasury lock settlements was $1.3 million and $1.4 million, respectively, and for the nine months ended September 30, 2018 and 2017, amortization of treasury locks was $4.0 million and $4.2 million, respectively. For the three months ended September 30, 2018 and 2017, amortization of financing costs was $0.7 million and $0.5 million, respectively, and during the nine months ended September 30, 2018 and 2017, amortization of financing costs was $2.0 million and $1.5 million, respectively. At September 30, 2018, we had $2,496.2 million of fixed-rate senior notes outstanding. The fair value of our fixed-rate debt was estimated to be $2,478.0 million. The difference between the book value and fair value is due to the difference between the period-end market interest rate and the stated rate of our fixed-rate debt. We estimated the fair value of our fixed-rate debt using quoted market prices (Level 2 inputs) within the fair value hierarchy, which is further defined in Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2017 Annual Report on Form 10-K. For more information on our long-term debt and interest rates on that debt, see Note 9, Debt, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2017 Annual Report on Form 10-K.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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