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Senior Notes - Additional Information (Details) | Sep. 30, 2020 USD ($) | Dec. 06, 2019 USD ($) | Sep. 30, 2019 USD ($) | May 08, 2018 USD ($) | Jul. 14, 2010 USD ($) Contract
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Debt Disclosure [Line Items] |  |  |  |  |
Debt issuance costs | $ 10,600,000 |  | $ 5,200,000 |  |
July 2010 Senior Notes |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  |  |  |  | $ 245,000,000
Number of series of Senior Notes issued | Contract |  |  |  |  | 4
May 2018 Senior Notes |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  |  |  | $ 400,000,000 |
December 2019 Senior Notes |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  | $ 350,000,000 |  |  |

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