Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) (Parentheticals) (Details)

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Accumulated Other Comprehensive Income (Loss) (Parentheticals) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Change Related to Cash Flow Hedges  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Gain expected to be reclassified into earnings in next 12 months $ 9.4