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Subsequent Events - Narrative (Details) $ in Millions	Jan. 22, 2019 USD ($) derivative	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Notional amount of derivative		$ 10,735.4	$ 9,038.2
Subsequent Event
Subsequent Event [Line Items]
Number of cash flow hedges entered into | derivative	3
Cash Flow Hedge 1 | Subsequent Event
Subsequent Event [Line Items]
Notional amount of derivative	$ 1,000.0
Derivative instrument stated interest rate	2.56%
Cash Flow Hedge 2 | Subsequent Event
Subsequent Event [Line Items]
Notional amount of derivative	$ 500.0
Derivative instrument stated interest rate	2.56%
Cash Flow Hedge 3 | Subsequent Event
Subsequent Event [Line Items]
Notional amount of derivative	$ 500.0
Derivative instrument stated interest rate	2.55%
Variable Rate Debt | Subsequent Event
Subsequent Event [Line Items]
Long-term debt	$ 2,000.0

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- Definition

Derivative Instrument, Interest Rate, Stated Percentage

+ References

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- Definition

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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+ 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=6879938&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

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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