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Debt | 12 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Debt | Debt On March 31, 2017, the Company entered into a $400.0 million syndicated credit facility (“Credit Agreement”) that extends to March 2022. Interest on the borrowings under the Credit Agreement accrue at variable rates, based upon LIBOR or a defined “Base Rate,” both determined based upon the rating of the Company’s senior unsecured long-term debt (the “Debt Rating”). The applicable margin to be added to LIBOR ranges from 1.00% to 1.75% (1.50% as of June 30, 2018), and for Base Rate-determined loans, from 0.00% to 0.75% (0.50% as of June 30, 2018). The Company also pays a quarterly commitment fee ranging from 0.125% to 0.400% (0.275% as of June 30, 2018), determined based upon the Debt Rating, of the unused portion of the $400.0 million commitment under the Credit Agreement. In addition, the Company must pay certain letter of credit fees, ranging from 1.00% to 1.75% (1.50% as of June 30, 2018), with respect to letters of credit issued under the Credit Agreement. The Company has the right to voluntarily prepay and re-borrow loans and to terminate or reduce the commitments under the facility. As of June 30, 2018, the Company had $6.0 million of issued letters of credit under the Credit Agreement, with the balance of $394.0 million available to the Company. The Company is subject to certain financial and restrictive covenants under the Credit Agreement, which, among other things, require the maintenance of a minimum interest coverage ratio of 3.50 to 1.00. The interest coverage ratio is defined in the Credit Agreement as, for any period, the ratio of consolidated earnings before interest, taxes, depreciation and amortization and non-cash net pension expense (“EBITDA”) to consolidated interest expense for such period. The Credit Agreement also requires the Company to maintain a debt to capital ratio of less than 55 percent. The debt to capital ratio is defined in the Credit Agreement as the ratio of consolidated indebtedness, as defined therein, to consolidated capitalization, as defined therein. As of June 30, 2018, the Company was in compliance with all of the covenants of the Credit Agreement. Long-term debt outstanding as of June 30, 2018 and 2017 consisted of the following:
|  | June 30,
($ in millions) |  | 2018 |  | 2017
Medium-term notes, Series B at 6.97% to 7.10% due from April 2018 to May 2018 (face value of $0.0 and $55.0 million at June 30, 2018 and 2017, respectively) |  | $ | — |  |  | $ | 55.0 |
Senior unsecured notes, 5.20% due July 2021 (face value of $250.0 million at June 30, 2018 and 2017) |  | 246.6 |  |  | 251.2 |
Senior unsecured notes, 4.45% due March 2023 (face value of $300.0 million at June 30, 2018 and 2017) |  | 299.1 |  |  | 298.8 |
Total |  | 545.7 |  |  | 605.0 |
Less: amounts due within one year |  | — |  |  | (55.0 | )
Long-term debt, net of current portion |  | $ | 545.7 |  |  | $ | 550.0 |
Aggregate maturities of long-term debt for the five years subsequent to June 30, 2018, are $0.0 million in fiscal years 2019, 2020, 2021, $250.0 million in 2022, and $300.0 million in 2023. For the years ended June 30, 2018, 2017 and 2016, interest costs totaled $31.1 million, $31.1 million and $29.9 million, respectively, of which $2.8 million, $1.3 million and $1.9 million, respectively, were capitalized as part of the cost of property, plant, equipment and software.

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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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