Derivative Instruments - Designated as hedging, Financial Performance Narrative (Details) - Designated as Hedging Instrument [Member] $ in Millions	6 Months Ended
Jun. 30, 2017 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassification from AOCI into Earnings, Estimate of Time to Transfer	12 months
Interest Expense [Member] \| Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) expected to be reclassified from AOCI into Earnings	$ (0.9)

Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration