Debt Instrument, Annual Amortization Percent

No definition available.

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Period Type:	duration

- Definition

Line of Credit, Number of Credit Facilities

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- 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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Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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)(1)
-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(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: 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

Reference 4: 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

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

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

- 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

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

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

- 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

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Debt - Narrative (Details)	1 Months Ended	9 Months Ended
Debt - Narrative (Details)	Oct. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) facility
Senior Secured Credit Facility
Debt Instrument [Line Items]
Commitment Fee		0.25%
Ten Million Committed Facility
Debt Instrument [Line Items]
Maximum Borrowing Capacity		$ 10,000,000
Letter of Credit \| Three Committed Letter of Credit Facilities
Debt Instrument [Line Items]
Available capacity amount		$ 44,000,000
Number of term loan facilities \| facility		3
Amount available		$ 104,000,000
Undrawn letters of credit		60,000,000
Letter of Credit \| Forty Million Committed Letter Of Credit Facility
Debt Instrument [Line Items]
Available capacity amount		40,000,000
Letter of Credit \| Fifty Four Million Committed Letter Of Credit Facility
Debt Instrument [Line Items]
Available capacity amount		54,000,000
Letter of Credit \| Two Unsecured Letter Of Credit Facilities
Debt Instrument [Line Items]
Available capacity amount		$ 15,000,000
Number of term loan facilities \| facility		2
Amount available		$ 57,000,000
Undrawn letters of credit		42,000,000
Letter of Credit \| Seventeen Million Unsecured Letter of Credit Facility
Debt Instrument [Line Items]
Maximum Borrowing Capacity		17,000,000
Letter of Credit \| Forty Million Uncommitted Letter of Credit
Debt Instrument [Line Items]
Maximum Borrowing Capacity		$ 40,000,000
Minimum \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Commitment Fee		0.15%
Maximum \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Commitment Fee		0.40%
Revolving Credit Facility \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 1,000,000,000
Line of credit maturity period	5 years
Available capacity amount		$ 694,000,000
Term Loan Facility \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 500,000,000
Annual amortization percent	5.00%
Debt maturity period	5 years
Senior unsecured notes \| Six hundred million senior unsecured notes
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 600,000,000
Debt maturity period	10 years
Interest Rate Percentage	4.625%
LIBOR \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Interest rate margin		1.75%
LIBOR \| Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Interest rate margin		1.25%
LIBOR \| Senior Secured Credit Facility \| Maximum
Debt Instrument [Line Items]
Interest rate margin		2.50%
Base Rate \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Interest rate margin		0.75%
Base Rate \| Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Interest rate margin		0.25%
Base Rate \| Senior Secured Credit Facility \| Maximum
Debt Instrument [Line Items]
Interest rate margin		1.50%