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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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