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Debt, Interest Income, Expense and Other Finance Costs - Additional Information (Details) - USD ($) | Sep. 30, 2019 | Jul. 23, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Line of Credit | Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity |  | $ 1,300,000,000 |
Long-term debt | $ 150,000,000.0 |  | $ 170,000,000.0
Long-term debt, current maturities | 12,500,000 |  |
Senior Notes | Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 518,900,000 | $ 525,000,000.0 | $ 514,800,000

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