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Debt - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 26, 2021 | Jul. 10, 2020 | Jun. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt | $ 694,300,000 |  | $ 694,300,000 |  |  |  | $ 551,800,000
Letters of credit issued | 5,400,000 |  | 5,400,000 |  |  |  |
Short-term credit agreement borrowings | 0 |  | 0 |  |  |  | 170,000,000.0
Interest costs | 10,100,000 | $ 7,200,000 | 30,400,000 | $ 22,100,000 |  |  |
Interest costs, capitalized | 1,200,000 | 2,300,000 | 6,900,000 | 6,500,000 |  |  |
Debt extinguishment losses, net | 0 | $ 0 | 8,200,000 | $ (0.0) |  |  |
Interest Rate Swaps |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative, gain on derivative |  |  | $ 2,300,000 |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Current borrowing capacity |  |  |  |  | $ 300,000,000.0 |  |
Debt instrument, covenant, credit commitment amount |  |  |  |  | 300,000,000.0 |  |
Maximum borrowing capacity |  |  |  |  | 500,000,000.0 |  |
Commitment fee rate |  |  | 0.35% |  |  |  |
Short-term credit agreement borrowings | 0 |  | $ 0 |  |  |  |
Credit Agreement available for future borrowings | $ 294,600,000 |  | $ 294,600,000 |  |  |  |
Borrowing rate | 2.11% |  | 2.11% |  |  |  |
Required interest coverage ratio one |  |  | 3.00 |  |  |  |
Required interest coverage ratio two |  |  | 3.50 |  |  |  |
Minimum available liquidity | $ 150,000,000.0 |  | $ 150,000,000.0 |  |  |  |
Asset coverage ratio |  |  | 1.10 |  |  |  |
Line of Credit | Letters of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 40,000,000.0 |  |
Letter of credit fees |  |  | 2.00% |  |  |  |
Minimum | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee rate |  |  | 0.275% |  |  |  |
Minimum | Line of Credit | Letters of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letter of credit fees |  |  | 1.25% |  |  |  |
Maximum | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee rate |  |  | 0.375% |  |  |  |
Required debt to capital ratio (less than) | 0.55 |  | 0.55 |  |  |  |
Maximum | Line of Credit | Letters of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letter of credit fees |  |  | 2.25% |  |  |  |
LIBOR | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  | 2.00% |  |  |  |
LIBOR | Minimum | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  | 1.25% |  |  |  |
LIBOR | Maximum | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  | 2.25% |  |  |  |
Base Rate | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  | 1.00% |  |  |  |
Base Rate | Minimum | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  | 0.25% |  |  |  |
Base Rate | Maximum | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate margin |  |  | 1.25% |  |  |  |
Senior unsecured notes, 6.375% due July 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  | $ 400,000,000 |
Interest rate | 6.375% |  | 6.375% |  |  | 6.375% |
Long-term debt | $ 394,900,000 |  | $ 394,900,000 |  |  |  | 0
Senior unsecured notes, 5.20% due July 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 250,000,000.0 | $ 250,000,000.0
Interest rate |  |  |  |  |  |  | 5.20%
Long-term debt | 0 |  | 0 |  |  |  | $ 252,300,000
Debt extinguishment losses, net |  |  | 10,500,000 |  |  |  |
Senior unsecured notes, 4.45% due March 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount | $ 300,000,000.0 |  | $ 300,000,000.0 |  |  |  | $ 300,000,000.0
Interest rate | 4.45% |  | 4.45% |  | 4.45% |  | 4.45%
Long-term debt | $ 299,400,000 |  | $ 299,400,000 |  | $ 300,000,000.0 |  | $ 299,500,000

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