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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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-Publisher FASB
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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