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Debt - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Jun. 30, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Short-term debt | $ 25,000,000 |  | $ 25,000,000 |  | $ 0
Interest costs | 7,600,000 | $ 7,700,000 | 22,300,000 | $ 22,900,000 |
Interest costs, capitalized | 400,000 | $ 600,000 | 1,500,000 | $ 2,000,000 |
Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | 500,000,000 |  | 500,000,000 |  |
Letters of credit issued | 7,600,000 |  | 7,600,000 |  |
Short-term debt | 25,000,000 |  | 25,000,000 |  |
Credit Agreement available for future borrowings | $ 467,400,000 |  | $ 467,400,000 |  |
Credit Agreement | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate basis |  |  | LIBOR |  |
Interest rate margin (as a percent) |  |  | 1.45% |  |
Credit Agreement | LIBOR | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.75% |  |
Credit Agreement | LIBOR | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin (as a percent) |  |  | 1.90% |  |
Credit Agreement | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate basis |  |  | Base Rate |  |
Interest rate margin (as a percent) |  |  | 0.45% |  |
Credit Agreement | Base Rate | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.00% |  |
Credit Agreement | Base Rate | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin (as a percent) |  |  | 0.90% |  |
Letters of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee rate (as a percent) |  |  | 0.225% |  |
Letter of credit fees (as a percent) |  |  | 1.45% |  |
Required interest coverage ratio |  |  | 3.50 |  |
Letters of credit | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee rate (as a percent) |  |  | 0.075% |  |
Letter of credit fees (as a percent) |  |  | 0.75% |  |
Letters of credit | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee rate (as a percent) |  |  | 0.375% |  |
Letter of credit fees (as a percent) |  |  | 1.90% |  |
Required debt to capital ratio (less than 55%) | 0.55 |  | 0.55 |  |

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