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Long-Term Debt (Senior Unsecured Fixed Rate Notes) (Details) - Senior Notes - USD ($) | 12 Months Ended |  |
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Jun. 30, 2016 | Jun. 30, 2015 | May 31, 2016 | Jan. 15, 2015
Senior Notes 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount |  |  | $ 600,000,000 |
Debt instrument stated interest rate |  |  | 5.875% |
Interest expense | $ 2,900,000 |  |  |
Senior Notes 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount |  |  |  | $ 800,000,000.0
Debt instrument stated interest rate |  |  |  | 5.625%
Interest expense | $ 45,000,000 | $ 20,600,000 |  |

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