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Debt - 2014 Senior Notes (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 16, 2018 | Oct. 06, 2014 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | $ (56,400,000) | $ (55,700,000) | $ (57,900,000) | $ (56,000,000.0) | $ (55,500,000) | $ (55,300,000) | $ (100,500,000) | $ (56,200,000) | $ (225,994,000) | $ (267,519,000) | $ (231,310,000)
2014 Senior Notes | The 2022 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.75% |  |  |  |  |  |  |  |  |  |  |
Redemption price (in percent) | 104.313% |  |  |  |  |  |  |  |  |  |  |  |
2014 Senior Notes | The 2024 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.875% |  |  |  |  |  |  |  |  |  |  |
Fair value of debt instrument |  |  | $ 866,000,000.0 |  |  |  |  |  |  |  | $ 866,000,000.0 |  |
Interest expense | $ 34,500,000 |  |  |  |  |  |  |  |  |  |  |  |
2014 Senior Notes | The 2024 Notes | Prior to July 15 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price (in percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
2014 Senior Notes | The 2024 Notes | On or after July 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price (in percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |

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