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Debt, Interest Income, Expense and Other Finance Costs - Debt Instruments (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jul. 31, 2019 | Dec. 31, 2018
Credit Facility |  |  |
Debt |  |  |
Amount outstanding | $ 55,000,000.0 |  | $ 170,000,000.0
Unused portion of facility | 1,200,000,000 |  | 985,900,000
Letters of credit and bankers' acceptances |  |  |
Debt |  |  |
Amount outstanding | 4,300,000 |  | 4,100,000
Other uncommitted credit lines |  |  |
Debt |  |  |
Letters of credit, outstanding amount | 375,200,000 |  | 303,600,000
Credit Facility | Amended credit facility |  |  |
Debt |  |  |
Borrowing capacity | 200,000,000.0 |  |
Maximum additional borrowings available at the entity's request subject to satisfaction of certain conditions | 400,000,000.0 |  |
Line of Credit | Credit Facility |  |  |
Debt |  |  |
Borrowing capacity |  | $ 1,300,000,000 |
Long-term debt | 55,000,000.0 |  | 170,000,000.0
Senior Notes |  |  |
Debt |  |  |
Amount of term loan outstanding | $ 515,600,000 |  | 514,800,000
Senior Notes | Base rate |  |  |
Debt |  |  |
Basis points added to reference rate | 0.75% |  |
Senior Notes | Eurodollar |  |  |
Debt |  |  |
Basis points added to reference rate | 1.75% |  |
Senior Notes | Term Loans |  |  |
Debt |  |  |
Long-term debt | $ 515,600,000 | $ 525,000,000.0 | $ 514,800,000

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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