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Debt, Interest Income, Expense and Other Finance Costs - Additional Information (Details) - USD ($)	Jul. 23, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, current maturities		$ 13,100,000
Line of Credit | Credit Facility
Debt Instrument [Line Items]
Borrowing capacity		1,200,000,000
Long-term debt		167,000,000.0	$ 170,000,000.0
Line of Credit | Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Borrowing capacity	$ 1,300,000,000
Senior Notes | Term Loans
Debt Instrument [Line Items]
Long-term debt		$ 498,000,000.0	$ 514,800,000
Senior Notes | Term Loans | Subsequent Event
Debt Instrument [Line Items]
Long-term debt	$ 525,000,000.0

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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
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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