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Hedges and Derivative Financial Instruments - Narrative (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) contract	Dec. 31, 2017 USD ($) contract
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of interest rate derivatives held (in contracts) | contract	0	0
Net hedge ineffectiveness gain (loss)	$ 0	$ 0
Interest rate cash flow hedge loss to be reclassified during next 12 months	$ 45,000,000

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Amount of gain (loss) from the ineffectiveness of the hedge.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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-SubTopic 30
-Section 50
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Number of interest rate derivative instruments held by the entity at the reporting date.

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