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Debt (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2014 Medium-term notes, Series B at 6.74% to 7.10% due from April 2018 to May 2018 | Jun. 30, 2013 Medium-term notes, Series B at 6.74% to 7.10% due from April 2018 to May 2018 | Jun. 30, 2014 Medium-term notes, Series B at 6.74% to 7.10% due from April 2018 to May 2018 Minimum | Jun. 30, 2013 Medium-term notes, Series B at 6.74% to 7.10% due from April 2018 to May 2018 Minimum | Jun. 30, 2014 Medium-term notes, Series B at 6.74% to 7.10% due from April 2018 to May 2018 Maximum | Jun. 30, 2013 Medium-term notes, Series B at 6.74% to 7.10% due from April 2018 to May 2018 Maximum | Jun. 30, 2014 Senior unsecured notes, 5.20% due July 2021 | Jun. 30, 2013 Senior unsecured notes, 5.20% due July 2021 | Jun. 30, 2014 4.45% Senior Unsecured Notes due 2023 | Jun. 30, 2013 4.45% Senior Unsecured Notes due 2023 | Mar. 31, 2013 4.45% Senior Unsecured Notes due 2023 | Feb. 26, 2013 4.45% Senior Unsecured Notes due 2023
Long-term debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 55.0 | $ 55.0 |  |  |  |  | $ 250.0 | $ 250.0 | $ 300.0 | $ 300.0 | $ 300.0 | $ 300.0
Interest rate (as a percent) |  |  |  |  |  | 6.97% | 6.97% | 7.10% | 7.10% | 5.20% | 5.20% | 4.45% | 4.45% |  | 4.45%
Total | 604.3 | 604.2 |  | 55.0 | 55.0 |  |  |  |  | 249.7 | 249.7 | 299.6 | 299.5 |  |
Long-term debt, net of current portion | 604.3 | 604.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt, 2015 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt, 2016 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt, 2017 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt, 2018 | 55.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt, 2019 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt, thereafter | 550.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest costs | 32.1 | 27.8 | 25.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest costs, capitalized | $ 15.1 | $ 6.8 | $ 1.2 |  |  |  |  |  |  |  |  |  |  |  |

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