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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Gain on cash flow hedges, tax expense $ 0.0 $ 0.0 $ 0.2