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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net gain (loss) on qualifying cash flow hedging instruments held by an affiliate $ (4.8) $ 0.0 $ 4.9