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Statements of Consolidated Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax $ 0.2 $ 0.9
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 3.0 (43.6)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax $ (0.1) $ (0.1)