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Revolving Credit Facility (Details) - Credit And Guarantee Agreement - Line of Credit - USD ($) |  | 1 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Feb. 28, 2018 | Dec. 31, 2018
Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 600,000,000.0 | $ 725,000,000.0 |
Debt issuance fees | $ 2,600,000 | 400,000 |
Debt instrument, term | 5 years |  |
Line of credit facility, accordion feature, increase limit |  | $ 275,000,000.0 |
Unused capacity, commitment fee percentage |  | 0.20% |
Covenant terms, minimum liquidity balance |  | $ 100,000,000.0 |
Aggregate letters of credit outstanding amount |  |  | $ 68,500,000
Remaining borrowing capacity |  |  | $ 656,500,000
Revolving Credit Facility | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate |  | 1.50% |
Revolving Credit Facility | Base Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate |  | 0.50% |
Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 187,500,000.0 |
Commitment fee percentage |  | 1.50% |
Fronting fee |  | 0.125% |

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- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
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Balance Type: | credit
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- Definition Line Of Credit Facility, Covenant Terms, Liquidity Ratio Required, Minimum + References No definition available. + Details
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- Definition Line Of Credit Facility, Fronting Fee Percentage + References No definition available. + Details
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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 Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition 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. + References No definition available. + 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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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