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v3.20.2

Debt Commitments - Unsecured Revolving Credit Facility (Details) - Credit Facility | 6 Months Ended
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Jun. 30, 2020 USD ($)
Minimum |
Debt Instrument [Line Items] |
Percentage fee paid for unused portion of credit facility | 0.10%
Maximum |
Debt Instrument [Line Items] |
Percentage fee paid for unused portion of credit facility | 0.125%
LIBOR |
Debt Instrument [Line Items] |
Per annum interest rate over LIBOR | 0.95%
Unsecured Revolving Credit Facility |
Debt Instrument [Line Items] |
Credit facility, maximum borrowing capacity | $ 700,000,000.0
Letter of Credit Subfacility |
Debt Instrument [Line Items] |
Credit facility, maximum borrowing capacity | $ 55,000,000.0

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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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |