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Debt - Schedule of Long-term Debt Outstanding (Details) - USD ($) | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | ---
Revolving Credit Agreement |  |
Total | $ 545,700,000 | $ 605,000,000
Less: amounts due within one year | 0 | (55,000,000)
Long-term debt, net of current portion | 545,700,000 | 550,000,000
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) |  |
Revolving Credit Agreement |  |
Face amount | 0 | 55,000,000.0
Total | $ 0 | 55,000,000
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) | Minimum |  |
Revolving Credit Agreement |  |
Interest rate | 6.97% |
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) | Maximum |  |
Revolving Credit Agreement |  |
Interest rate | 7.10% |
Senior unsecured notes, 5.20% due July 2021 (face value of $250.0 million at June 30, 2018 and 2017) |  |
Revolving Credit Agreement |  |
Interest rate | 5.20% |
Face amount | $ 250,000,000.0 | 250,000,000.0
Total | $ 246,600,000 | 251,200,000
Senior unsecured notes, 4.45% due March 2023 (face value of $300.0 million at June 30, 2018 and 2017) |  |
Revolving Credit Agreement |  |
Interest rate | 4.45% |
Face amount | $ 300,000,000.0 | 300,000,000.0
Total | $ 299,100,000 | $ 298,800,000

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